Hi, help with these two questions.
1. Write the isotope notation for an atom with 9 protons and an atomic mass of 20.
2. Write the isotope notation for an atom with 13 protons and 12 neutrons.
Answers
Answer:
Answered below
Explanation:
1) Atomic number is usually the number of protons
Since the atom is a neutral atom, Number of protons is equal to the number of electrons.
Thus means that we have 9 electrons and our atomic number is 9.
Atomic mass number is given as 20.
The is topic notation makes use of the atomic number and mass number.
Atomic number of 9 denotes fluorine.
Thus, the isotopic notation is written as attached;
2) we are told that an atom has 13 protons and 12 neutrons.
Similar to A above,
Atomic number is 13.
Now, number of neutrons + number of protons = mass number.
Thus;
Mass number = 13 + 12 = 25
Element with atomic number of 12 is magnesium
Thus,isotopic notation is as attached.
Related Questions
For the formation of hydrogen iodide, H2(g) + 12(g) - 2HI(g) the value of the
equilibrium constant at 700K is 54.7. If one mole of H2 and one mole of 12 are the
only materials initially present, what will be the equilibrium concentrations of H2,
12, and HI.
Answers
Answer:
t 700 K, the equilibrium constant for the reaction;
H
2(g)
+I
2(g)
⇌2HI
(g)
is 54.8.
If 0.5 mol litre
−1
of HI
(g)
is present at equilibrium at 700 K, what are the concentrations of H
2(g)
and I
2(g)
assuming that we initially started with HI
(g)
and allowed it to reach equilibrium at 700 K.
in which of the following does the land being moved contin approximately 60% water
Answers
Answer:
C
Explanation:
The answer is C because only that amount can move
A container of gas is initially at 0.500 atm and 298 K. What will the pressure be at 398 K?
Answers
Answer:
5
Explanation:
H2O2 → H2O + O2
This is showing the reaction that we used in elephant’s toothpaste. Write and balance this equation on your own sheet of paper. If 24.53 g of hydrogen peroxide decompose, how many grams of water are produced.
Answers
Answer:
75.47
Explanation:
AS WE CANT WEIGHT AIR THE ANSWER IS CORRECT
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is CuO a covalent or ionic bond?
The electronegativity difference is less than 1.7, which would make it a covalent bond. But I am still not sure..
Answers
Answer:
Ionic bond
Explanation:
Covalent bonds can only form between non-metals and copper is a metal so it would be an ionic bond.
CuO (copper(II) oxide) is a compound with a covalent bond. The electronegativity difference is less than 1.7, which would make it a covalent bond.
In a covalent bond, atoms share electrons to form a stable molecule. The electronegativity difference between copper (Cu) and oxygen (O) is less than 1.7, indicating a nonpolar covalent bond. This means that the electrons in the bond are shared relatively equally between the copper and oxygen atoms, resulting in a molecule with a low degree of polarity.
Copper is a transition metal with an electronegativity of around 1.9, and oxygen has an electronegativity of approximately 3.44. The electronegativity difference (3.44 - 1.9 = 1.54) is less than 1.7, confirming that the bond between copper and oxygen is covalent rather than ionic.
In ionic bonds, the electronegativity difference is typically larger than 1.7, leading to a transfer of electrons from one atom to another, resulting in the formation of ions. Since the electronegativity difference in CuO is less than 1.7, it is considered a covalent bond.
To know more about copper(II) oxide here
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The Beryllium (Be) atom has 4 protons, 4 electrons (2 valence e- ), and 5 neutrons. It is on the 2nd period, so it has two electron shells
Answers
(diagram below)
1. has two electron shells, so draw two rings around the nucleus
2. has 4 electrons, and since the first shell always has two the second shell would have 2 as well (to add up to four). this makes sense, because the description says that Be has 2 valence electrons
3. Draw 4 protons inside the grey circle (the nucleus)
4. Draw 5 neutrons inside the grey circle too (the nucleus)
they don't have to be in any particular order, hope this helps!
Beryllium (Be) atom has 5 neutrons, 4 electrons and 4 protons. It has two electron shells as it is in the second period of the periodic table.
Only two electrons can fit in the first shell, which is the innermost shell. Beryllium has two electrons in its initial shell. There are additionally 2 electrons in the second shell, which is the outermost shell for beryllium. Valence electrons are the moniker for these outermost electrons.
The electron configuration of beryllium is 1s² 2s², where the superscript refers to the number of electrons in each orbital and shell. The two electrons in the 1s orbital of the first shell are denoted by the symbol 1s², while the two electrons in the 2s orbital are denoted by the symbol 2s².
Learn more about electron configuration, here:
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D. conduction and induction
8. Which phrase describes grounding?
A. charging an object by polarization
B. providing a safe path for electrons to flow
C. changing a substance from a conductor to an insulator
D. using a device that prevents the flow of electric current
Answers
The answer that you are looking for is
Answer:
B
Answer:
D
Explanation:
using a device that prevent the flow of electric current.
This is your answer because it describes it
When using pH paper, the pH of a solution can be determined by looking at the _______ of the paper.
Answers
Colour
Hope this helps
Please help!! I'll name you brainliest!!
Answers
Answer:
the awnsers are A and C
Explanation:
because
How do you create a sedimentary
rock?
Help please!!!!15 points
Answers
What causes warm air to rise?
a. The fact that it's less dense than cold air.
b. The fact that it weighs more than cold air.
c. The fact that it has higher pressure than cold air.
d. The fact that it's more dense than cold air.
Answers
which one of these is NOT a unit for a reaction rate. 1) g/mL 2) M/min
Answers
G/ml is not a unit of time this the answer
The useful energy a light bulb gives out is
(a). kinetic energy (b) chemical energy (c) light energy
science subject
Answers
Answer:
Light bulb gives light energy which is usefull
Answer:
(c) light energy
Explanation:
As bulb is used for giving light and hence the energy that it gives is light energy.
By what factor does the average kinetic energy of helium atoms in a balloon change as the helium gas is heated from -100.0°C to 73°C? Show all calculations.
Answers
Answer:
Explanation:
is it possible for a balloon with initial pressure of 200 spa to naturally expand ... a sample of argon gas is at pressure 124 kpa and a temp. of 24 degrees C in a ... calculate volume that 2.25 moles of oxygen gas will occupy at standard temp. and pressure ... explain how avg kinetic energy of helium atoms changes as the temp ...
Which of the following can act as a Bronsted-Lowry acid?
1 H2O
2 NH
3 H2O
Answers
Answer:
H 2 O
Explanation:
H 2 O can act as a Brønsted-Lowry acid by donating a proton to produce its conjugate base OH - (known as the hydroxide ion). H 2 O can act as a Brønsted-Lowry base by accepting a proton to produce its conjugate acid H 3 O + (known as the oxidanium ion, or oxonium ion, or, in older textbooks as the hydronium ion (5)).
the usa flag..........
Answers
Answer:
lol
Explanation:
How are different ions determined?
Answers
Use the following terms in the same sentence chemical reaction and precipitate
Answers
Answer: Precipitate is a sign that a chemical reaction has occurred.
A plant releases oxygen into the ground through its roots. True or false
Answers
Answer:
false
Explanation:
This statement is false because plants release waste material, like oxygen, through small holes in the plants leaves.
How many do each element are present in the following formula? 3 Ca3 (PO4)2 + 4 CaO
I really need help plz help if you can!!!!!
Answers
3 Ca3 (PO4)2 + 4 CaO
So we can see that there are 3 Ca3 (Ca3, Ca3, Ca3), which means you multiply the subscript by the coefficient, meaning 9 Ca. Then we see (PO4)2, which means that there are two PO4 (PO4, PO4) so we multiply the subscript 2 by the subscript 4 on O to equal 8 O, and we multiply the subscript 2 by the subscript 1 on P (the 1 is not written) to equal 2 P.
So far we have 9 Ca, 8 O, and 2 P.
One last term, 4 CaO (means CaO, CaO, CaO, CaO) which translates to 4 Ca and 4 O.
Add them all together and you get (9+4=13) 13 Ca, (8+4=12) 12 O, and 2 P
Which processes occur when energy is removed from a substance
Answers
Answer:
Note that melting and vaporization are endothermic processes in that they absorb or require energy, while freezing and condensation are exothermic process as they release energy.
What was the main purpose of the Colosseum in Rome?
It served as a space for public debates.
It was a place dedicated to the many gods.
It was used by leaders to address the citizens.
It was used to provide entertainment for the public.
Answers
Answer:
It was used to provide entertainment for the public.Explanation:
The Colosseum was basically an amphitheatre. It was a stage area where the public can see entertainment and concerts. The public also viewed executions of people who committed very bad crimes. The answer to the question is It was used to provide entertainment for the public.
ANWSER:It was used to provide entertainment for the public.
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What causes Earth’s major wind patterns?
Question 1 options:
Radiant energy from the sun strikes Earth unevenly.
The density of ocean water changed wind patterns
The latitudes of different areas
The Earth is spinning
Answers
Answer:
A.
Explanation:
The sun unevenly hits the Earth, causing wind to form and move around the poles; never constant.
Answer:
A is correct i just took the quiz and got it right
Explanation:
(Please Help)
when adding a coefficient to a molecule what must you do to all atoms of that molecule?
A.Only multiple the first atom of the coefficient
B. multiply all of the atoms by the coefficient
C. Add the coefficient and the subscripts together, then divide them all by 2.
Answers
Answer:
B
Explanation:
Trust me I've had problems like these
For the reaction magnesium plus hyrdogen chloride yeilds hydrogen and magnesium chloride, calculate the percent yield of magnesium chloride if 100. G of magnesium react with excess hydrochloric acid to yield 330. G of magnesium chloride
Answers
Answer:
Percentage yield of MgCl₂ = 83.4%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
Mg + 2HCl —> MgCl₂ + H₂
Next we shall determine the mass of of Mg that reacted and the mass of MgCl₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of Mg = 24 g/mol
Mass of Mg from the balanced equation = 1 × 24 = 24 g
Molar mass of MgCl₂ = 24 + (35.5×2)
= 24 + 71
= 95 g/mol
Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 g
SUMMARY:
From the balanced equation above,
24 g of Mg reacted to produce 95 g of MgCl₂.
Next, we shall determine the theoretical yield of MgCl₂. This can be obtained as follow:
From the balanced equation above,
24 g of Mg reacted to produce 95 g of MgCl₂.
Therefore, 100 g of Mg will react to produce = (100 × 95)/24 = 395.83 g of MgCl₂.
Thus, the theoretical yield of MgCl₂ is 395.83 g
Finally, we shall determine the percentage yield of MgCl₂. This can be obtained as follow:
Actual yield of MgCl₂ = 330 g
Theoretical yield of MgCl₂ = 395.83 g
Percentage yield of MgCl₂ =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 330 / 395.83 × 100
Percentage yield of MgCl₂ = 83.4%
Can somebody help me please! Help would be much appreciated :))
Answers
Answer:
The first picture shows how the two H athoms finds each other. The second one, how these H athoms start's to form a covalent bond describing it by Lewi's estructure. And the last one, shows how the two athoms of H formed an H2 molecula.
Explanation:
What my happen in the ecosystem of the fox was removed
Answers
Answer:
the popilation of mice will increase, since the fox was their only predator. and the population of snakes will decrease. since the fox was its only food source.
(hope this helps)
(5 x 10-21) - (4 x 10-22)
Answers
Answer:
29 and 18
Explanation:
Answer:
11
Explanation:
5×10-21 = 29
4×10-22 = 18
29 - 18 = 11
Someone please help me with this, i'll give you the brainliest answer and give you a 5 star rating!
Answers
What is the molarity of the solution of Sodium hydroxide, if 35 ml of 0.1 M HCl is used in the titration of 25 ml of the barium hydroxide solution
Answers
Answer: The molarity of [tex]Ba(OH)_2[/tex] is 0.07 M
Explanation:
According to the neutralization law,
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1[/tex] = basicity [tex]HCl[/tex] = 1
[tex]M_1[/tex] = molarity of [tex]HCl[/tex] solution = 0.1 M
[tex]V_1[/tex] = volume of [tex]HCl[/tex] solution = 35 ml
[tex]n_2[/tex] = acidity of [tex]Ba(OH)_2[/tex] = 2
[tex]M_2[/tex] = molarity of [tex]Ba(OH)_2[/tex] solution = ?
[tex]V_2[/tex] = volume of [tex]Ba(OH)_2[/tex] solution = 25 ml
Putting in the values we get:
[tex]1\times 0.1\times 35=2\times M_2\times 25[/tex]
[tex]M_2=0.07[/tex]
Therefore, molarity of [tex]Ba(OH)_2[/tex] is 0.07 M