Distribution of Electrons in Different Orbits

Q.

What is the electron configuration of ${\mathrm{Cl}}^{-}$?

Q. The atomic number of oxygen is 8 and its electronic configuration is .

1. 2, 2, 4
2. 2, 4, 2
3. 2, 6

Q.

Why does the L shell not have d-orbitals?

Q.

Why the electronic configuration of potassium is $2,8,8,1$ and not $2,8,9$?

Q. Question 25
Write down the electron distribution of chlorine atom. How many electrons are there in the L shell?

Q. The atomic numbers of few elements are given below. Calculate the number of valence electrons in each case and find the value of X, Y and Z.

Elements	Atomic number	Number of valence electrons
Carbon	6	X
Nitrogen	7	Y
Oxygen	8	Z

1. X-4; Y-6; Z-5
2. X-4; Y-2; Z-5
3. X-2; Y-5; Z-6
4. X-4; Y-5; Z-6

Q.

Which of the following elements has the maximum number of Valence Electrons ?

1. Na

2. Al

3. Si

4. P

Q. The energy associated with each orbit as we move away from the nucleus.

1. decreases
2. increases
3. remains the same

Q.

What does the term ‘halogen’ mean? List the symbols and atomic numbers of all known halogens including the one recently discovered and named.

Q. Electronic configuration of argon is:

1. 2, 8, 1
2. 2, 8, 8
3. 2, 8, 2
4. 2, 8

Q. What is the electronic configuration of ${}_{18}^{40}\text{Ar}$?

1. 1, 8, 9
2. 2, 8, 8
3. 2, 8, 8, 3
4. 2, 8, 18, 12

Q. The atomic number of oxygen is 8 and its electronic configuration is .

1. 2, 2, 4
2. 2, 4, 2
3. 2, 6

Q. The atomic number of oxygen is 8 and its electronic configuration is .

1. 2, 2, 4
2. 2, 4, 2
3. 2, 6

Q.

Match the elements with electronic configuration

Column 1	Column 2
Chlorine	2, 8, 8, 1
Nitrogen	2, 8, 8
Phosphorous	2, 8, 7
Potassium	2, 8, 5
Argon	2, 5

Q. The energy associated with each orbit as we move away from the nucleus.

1. decreases
2. increases
3. remains the same

Q. What is the electronic configuration of ${}_{18}^{40}\text{Ar}$?

1. 1, 8, 9
2. 2, 8, 8
3. 2, 8, 8, 3
4. 2, 8, 18, 12

Q. The mass of an electron is _________ times the mass of a proton.

1. 1840
2. $\frac{1}{1840}$
3. $\frac{1}{184}$
4. 184

Q. Which of the following elements have two electrons in its K shell?

1. Hydrogen
2. Helium
3. Sodium
4. Aluminium

Q. Which of the following elements have two electrons in its K shell?

1. Hydrogen
2. Helium
3. Sodium
4. Aluminium

Q. According to Neils Bohr's atomic model, which of the following shells are present in an atom?

1. A shell
2. K shell
3. O shell
4. C shell
5. L shell
6. M shell
7. E shell
8. N shell

Q. Atomic number of chlorine is 17. How many electrons are present in the M shell of a chlorine atom?

1. 8
2. 2
3. 7
4. 4

Q. The maximum number of electrons that can be accommodated in a shell is given by the formula .

1. ${\text{n}}^2$
2. ${\text{2n}}^2$
3. ${\text{n}}^2$+1

Q.

If an element has 3 electrons in total, how will you distribute it among the shells?

1. 2 electrons in L shell and 1 electron in K shell.
2. All three electrons in L shell.
3. All three electrons in K shell.
4. 2 electrons in K shell and 1 electron in L shell.

Q. Choose the correct pair of shells and the maximum number of electrons that can be accommodated in it.

1. K
2. L
3. M
4. N
5. 2
6. 8
7. 18
8. 32

Q.

If an atom of an element has 34 electrons in total, then which orbit is the outermost orbit of the atom and how many valence electrons it contains?

1. N, 26

2. M, 2

3. N, 6

4. M, 26