Question

Answer only q 22 and 23

Answer 1

22
1.neon
2.aluminium
3.phosphorous
4.calcium
5.carbon

23
1.period-1-hydrogen, helium
period-2- lithium, berrylium, boron, carbon, nitrogen, oxygen, Florine,neon
period-3- sodium, magnesium, aluminum, silicon, phosphorus, sulphur, chlorine, argon
no of element in period 1= 2
period2= 8
period3=8
2. both have 8 electrons in their valence shell
3.a,non-metallic
b, metallic

hope it helps u

Answer 2

22.
1. Neon

2. Aluminum

3. Phosphorus

4. Calcium

5. Carbon

23.
1. There are 18 elements.
Period 1: Hydrogen, Helium
Period 2: Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon
Period 3: Sodium, Magnesium, Aluminium, Silicon, Phosphorous, Sulphur, Chlorine, Argon.

2. They have 8 valence electrons.

3. non-metallic, metallic