The properties of the elements can be determined from their electron configuration
Further explanation
- Mg ⇒electron configuration :[Ne] 3s²
outer electron : 2 (3s²)
lose(2 electron)
charge : +2
cation (positive)
symbol : Mg²⁺
- Br⇒electron configuration : [Ar] 4s²3d¹⁰4p⁵
outer electron : 7 (4s²4p⁵)
gain ( 1 electron)
charge : -1
anion (negative)
symbol : Br⁻
Helium⇒electron configuration : 1s²
outer electron : 2 (1s²)
stabil(no gain/no lose)
charge : 0
neutral
symbol : He
- Nitrogen ⇒electron configuration : [He] 2s²2p³
outer electron : 5 ( 2s²2p³)
gain(3 electron)
charge : -3
anion
symbol : N³⁻