Answer:
Excited state of an electron is the state attained by an electron after it has absorbed energy and it moves further from the nucleus.
an electron is at higher energy when excited and at lower energy when at ground state.
an excited electron is less stable due to the decrease in the nuclear force of attraction and the grounded electron is more stable due to it's close distance to the nucleus.
An electron in excited state has its electron present in higher energy level while an electron in ground state is present in lower energy level.
What is an energy level ?Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.
Energy of the stationary state is given as E= -R
1/n² where R
is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.
They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.
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#SPJ2
Can someone help me with number two pls
Answer:
The answer is G
Explanation:
this is because of what a element looks like on a periodic table
Answer:
F. 1 and 3
Elements are pure substance
What causes the air above a pot of boiling water to become warm?
The air transfers thermal energy to the water vapor.
The water vapor transfers thermal energy to the air.
The particles in the air lose kinetic energy.
The particles in the water vapor gain kinetic energy.
Answer: The water vapor transfers thermal energy to the air.
Explanation:
Which of these is a physical change in shape?
A. Digesting food
B. Cooking an egg
C. Breaking a glass
D. Dissolving salt
Planets A and B are both the same size, but planet B has three times the mass of planet A. How does the weight of an object compare on the two planets?
Choose the correct answer.
The weight of an object is the same on both planets.
The weight of an object is three times larger on planet A.
The weight of an object is three times larger on planet B.
The weight of an object will depend on more factors than just the weight and size of the planet.
Answer:
The answer is d
Explanation:
How r fossil fuel helpful
Plss help ill give brainliest
Answer: The United States gets 81% of its total energy from oil, coal, and natural gas, all of which are fossil fuels. We depend on those fuels to heat our homes, run our vehicles, power industry and manufacturing, and provide us with electricity.
Explanation:
....
Answer:
They give us things that we couldnt get anywhere else and arent harmful to the enviornment
Explanation:
Which answer choice correctly describes what will happen to an element with four valence electrons if it engages in a chemical reaction?
a. It will lose electrons.
b. It will neither gain nor lose electrons.
c. It will gain electrons.
d. It may gain or lose electrons.
Which among the following is/are correct about solution (true solution)?
I. Concentration of solute will always be the same throughout a mixture
in a solution.
II. Solutions do not show scattering of light.
(a) only I (b) only II
(c) both I and II (d) none
Answer
A
Explanation
letter a kase tama
Molecules in a liquid are:
closer together than in a gas
moving more quickly than in a solid
moving more slowly than in a gas
all of the above
Please help!!!
Answer:
all of the above
Explanation:
Which of the following is an example of quantitative data?
A.five eggs in each nest
B.oval-shaped eggs
C.small eggs
D.blue eggs with white specks
1. What happens to the height of the skater over time?
Answer:
if their genes want to grow any more, they'll grow.
Explanation:
How do you think the amount of a material affects its tendency to sink or float?
ASAP
Answer:
it dependes on the material
Explanation:
what is the material
Answer:
it doesnt
Explanation:
The amount of material does not reflect on its tendency to sink or float because that depends on density which is an intensive property.
2. Calculate the density of a rock that has a mass of 21.58 grams and causes the water in a
graduated cylinder to rise from 20.0yl to 25.4 ml.
Answer:
4.00 g/mL
Explanation:
Density is mass divided by volume (g/mL).
Mass of rock = 21.58
Volume of rock = 25.4 - 20.0 = 5.4mL
Density of rock = 21.58g / 5.4mL = 3.99629 g/mL
Round to the lowest number of significant figures which is three = 4.00 g/mL
Which pair of symbols represents nuclei with the same number of neutrons?
A. 56 Co and 580
B. 57Co and 58Ni
c. 57Fe and 58 Ni
D. 57Mn and 57Fe
Answer:
B
Explanation:
Mass number = number of neutrons + number of protons
Atomic number is the number of protons in the nucleus.
58Ni : 58 is the number of neutrons + number of protons
atomic number of Ni is 28. Thus, 58 -28 = 30 neutrons
57Co ; 57 is the number of neutrons + number of protons
number of Co is 27. Thus, 57 – 27 = 30 neutrons
2. What are the units for the mass of a solid? mass of a liquid?
Answer:
I'm not sure myself but I'd say mass since it's a solid
which element has the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8
Answer:
Darmstadtium
Explanation:
An element with the electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d⁸ has 110 electrons in its electron shells.
Since the element is a neutral atom, this number is also equal to its atomic number. Therefore, its atomic number is 110.
The element in the period table that has an atomic number of 110 is Darmstadtium, a d-block element, thus a transittion metal. It also belong to period 7 in the Periodic table of elements.
The element that has the electron configuration is Darmstadtium.
Electronic configuration:Since An element with the electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d⁸ contains 110 electrons in its electron shells.
Also, the element should be a neutral atom, this number should also equal to its atomic number. Therefore, its atomic number is 110.
The element in the periodic table that has an atomic number of 110 is Darmstadtium, a d-block element, thus a transition metal.
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a molecule for sulfur dioxide consists of one sulfur atoms (S) and two oxygen atoms (0). what is the chemical formula for this compound
The valence electrons are those found in the highest energy ____ and ___ orbitals
^Please help ASAP I’ll mark you as brainlister FILL in the blank
The outmost free electron which is present in the outer shell is called valency. The number of elements joining together to form the compound also depends on the valency.
Each electron has revolved around the nucleus and that path is considered as orbit. The orbit is as follows:-
SPDFThe free electrons are usually lie in the outmost shell.
Hence according to the question, the correct option is S and P orbit.
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2. When one plate is thrust under another plate it will create what landform?
a. Rift valley
b. Mountain range
C. Subduction zone-trench
d. Crater
Answer:
a
Explanation:
At what temperature does water boil at 101kPa?
Answer:
100°C
Explanation:
A liquid boils when the vapour pressure is the same as the atmospheric pressure. At 101kPa or 1 atm, water boils at the well known number of 100°C. If the pressure is different, you will have to use the Clausius Clapeyron Equation.
is muriatic acid a compound or not?
Which is the control center for the endocrine system?
O the thymus
the hypothalamus
the pancreas
o the thyroid
Answer: the hypothalamus
Thank you for the answer, it is much appreciated, and if you haven't seen it already, it is B.
Answer:
The answer is B on edge
Explanation:
Does the use of lithium cause human health problems?
Answer:
Yes
Explanation:
Lithium can cause nausea, diarrhea, dizziness, change in heart rhythm, muscle weakness, fatigue, and a dazed feeling
Continued use of Lithium could mean fine tremor, frequent urination, and thirst
Source: Webmd.com
the elements boron, silicon, germanium, and arsenic be classified into? *
Count the total number of atoms in CH4:
Answer:
5 atoms
Explanation:
there is 1 carbon atom and 4 hydrogen atoms
explain the relationships that are present between the frequency, wavelength, and amplitude of a wave in 3 to 5 sentences.
Answer:
Wavelength refers to the length of a wave from one peak to the next. The amplitude or height of a wave is measured from the peak to the trough. The wavelength is measured from peak to peak. Wavelength is directly related to the frequency of a given wave form.
A jogger with a mass of 60 kg is moving at 2 m/s. What is the jogger's kinetic energy?
Answer:
Ke = mgv
Explanation:
(60)(9.81)(2) =1177.2 joules persecond or Watts.
1.177 kilowatts
Need help ASAP please
Answer:Melting can create steam, kind of like a nukeular plant exept no nukulear rods
Which descriptions apply to prokaryotic cells? Check all that apply.
are usually single-celled
contain a nucleus
do not contain membrane-bound organelles
have DNA located in cytoplasm
Answer:
-are usually single celled
-do not contain membrane-bound organelles
-have DNA located in cytoplasm
Explanation:
currently taking the test
with of the following describe a chemical change
a) a metal fork was melted
b) a metal fork was cut in half
c) a metal fork became bent
d) a metal fork became rusted
Answer:
D
Explanation:
Rusting is a chemical change that occurs due to oxygen.
Answer:
d i had this your welcome
Which animal would you want to swim with the most, Dolphin or A White Whale?
Answer:
White whale
Explanation:
Just because I never seen a white whale:)