Electronic configuration

Question 1

How do you use groups and periods to calculate the electronic configuration of an atom

Answer 1

1. Look at the group that the element is in, draw that number of shells around the nucleus
2. Look at the period that the element is in, draw that number of electrons in the outer shell
3. Fill in the rest of the shells using the shell rule

Question 2

How many electrons are allowed in the first shell

Answer 2

2 (unless it is the only shell)

Question 3

How many electrons are allowed in the second shell

Answer 3

8 (unless it is the outer shell)

Question 4

How many electrons are allowed in the third shell

Answer 4

8 (unless it is the outer shell)