Question

If the subshell wise electronic configuration of an atom is 1s² 2s² 2p⁶ 3s² , find answers to the following:

1. How many shells are present in this atom?

2. Which are the sub shells of each shell?

3. Which is the sub shell to which the last electron was added?

4. What is the total number of electrons in the atom?

5. What is its atomic number?

6. How can the sub shell electronic configuration be written in a short form?

Answer 1

1. 3

2. K — Is, L — 2s, 2p, M — 3s

3. 3s

4. 12

5. 12

6. [Ne]3s²