Question

Write the atomic number and atomic mass of elments from 1 to 20

Answer 1

Answer:

hydrogen 1

helium 2

lithium 3

Berlium 4

boran 5

carbon 6

nitrogen 7

oxygen 8

fluorine 9

neon 10

sodium 11

magnesium 12

Aluminium13

silicon14

phosphorus 15

Sulphur 16

chlorine 17

argon 18

potassium 19

calcium 20