C1.8 - Electronic Structures

Question 1

Electronic shells

Answer 1

• each shell represents a fixed energy level

- lowest energy level is the shell closest to the nucleus

Question 2

Shell configuration

Answer 2

1st shell = holds 2 electrons max
2nd shell = holds 8 electrons max
3rd shell = holds 8 electrons max

Question 3

Formula to work out number of lecterns of an atom

Answer 3

Atomic number = number of electrons

Question 4

Writing electron structure

Answer 4

-start with the lowest energy level ( 2)
-go up in order
-separate with commas
E.g sodium = 2,8,1