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Aleks04 [339]
3 years ago
11

Which electron configuration represents the electrons of an atom in an excited state? * 2-3 2-7-1 2-8 2-8-1​

Chemistry
1 answer:
Lemur [1.5K]3 years ago
8 0

2-7-1

<h3>Further explanation </h3>

Electrons can move the shell up or down by releasing energy or absorbing energy  

Excited electrons show higher electron transfer to the shell by absorbing energy  

So it can be concluded that there are 2 conditions:  

Ground state is the state of electrons filling shell with the lowest energy levels.  

Excited state is the state of electrons which occupies a higher energy level  

The state of excited electrons can be seen from the presence of electrons which do not fill the skin completely but fill the skin afterward  

2-7-1

From its 8 electron configuration, filling 3 shells, 2 electrons in the firs shell, 7 electrons in the second shell and 1 electron in the third shell

the electrons in the third shell should fill the electrons in the second shell first according to Aufbau rule (lower energy shells)

\tt  1s^22s^22p^4\rightarrow ground~state\\\\1s^22s^22p^33s^1\rightarrow excited~state

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What is the length of a one-dimensional box for an electron (9.109 x 10-31 kg) with an n=1 energy of 479 kJ/mol? Give the answer
OverLord2011 [107]

Answer : The length of a one-dimensional box for an electron is 2.819\times 10^{31}\AA

Explanation :

The energy level of quantum particle in a one-dimensional box is given as:

E_n=\frac{n^2h^2}{8mL^2}

where,

E_n = 479 kJ/mol = 479000 J/mol

n = energy level = 1

h = Planck's constant = 6.626\times 10^{-34}Js

m = mass of electron = 9.109\times 10^{-31}kg

L = length of a one-dimensional box = ?

Now put all the given values in the above formula, we get:

479000J/mol=\frac{(1)^2\times (6.626\times 10^{-34}Js)^2}{8\times (9.109\times 10^{-31}kg)\times L^2}

L=2.819\times 10^{21}m

conversion used : 1m=10^{10}\AA

L=2.819\times 10^{31}\AA

Therefore, the length of a one-dimensional box for an electron is 2.819\times 10^{31}\AA

3 0
3 years ago
which statement best explains why chlorine is added to drinking water? A. Chlorine cures infections caused by bacteria or other
Rom4ik [11]

Answer:

to protect peoples teeth against cavities

Explanation:

i just know

4 0
3 years ago
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What would happen if the number of protons were to change in an atom
Reptile [31]

you would change one element to a diffrent element

3 0
3 years ago
Please help I’ll mark you as brainliest if correct!
Brums [2.3K]

Answer:

C.

Explanation:

Gas molecules are diatomic which means it usually comes in 2.

So, H2(g)+O2(g) is H2O (l)

The first one is OH(hydroxide, not water)

Second one is not gas(not diatomic)

Answer is C.

8 0
3 years ago
Dos moléculas de Clorato de Potasio en estado sólido, al aplicarle calor se descompone en dos moléculas de Cloruro de Potasio en
DedPeter [7]

Answer:

2KClO3 (s) -------> 2KCl (s) + 3O2 (g)

Explanation:

Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.

Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.

Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;

2KClO3 (s) -------> 2KCl (s) + 3O2 (g)

La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.

Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple

7 0
3 years ago
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