Question

isotopes of all first 20 element

Answer 1

Explanation:

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Answer 2

Answer:

Hydrogen 2 H-1 and H-2

Helium 2 He-3 and He-4

Lithium 2 Li-6 and Li-7

Beryllium 1 Be-9

Boron 2 B-10 and B-11

Carbon 2 C-12 and C-13

Nitrogen 2 N-14 and N-15

Oxygen 3 O-16, O-17 and O-18

Fluorine 1 F-19

Neon 3 Ne-20, Ne-21 and Ne-22

Sodium 1 Na-23

Magnesium 3 Mg-24, Mg-25 and Mg-26

Aluminium 1 Al-27

Silicon 3 Si-28, Si-29 and Si-30

Phosphorus 1 P-31

Sulphur 3 S-32, S-33 and S-34

Chlorine 2 Cl-35 and Cl-37

Argon 3 Ar-36, Ar-38 and Ar-40

Potassium 2 K-39 and K-41

Calcium 5 Ca-40, 42, 43, 44 and 46.