Question

Symbold of elements 1 to 20 with atomic no. And atomic mass

Answer 1

Element Atomic number Atomic mass

Hydrogen 1 1

Helium 2 4

Lithium 3 6.94

Beryllium 4 9.01

Boron 5 10.81

Carbon 6 12.01

Nitrogen 7. 14.01

Oxygen 8 15.99

Fluorine. 9. 19

Neon 10. 20.18

Sodium. 11. 22.99

Magnesium 12. 25.31

Aluminium 13. 26.98

Silicon 14. 28.09

Phosphorus. 15 30.97

Sulphur 16 32.07

Chlorine. 17. 35.45

Argon 18 39.95

Potassium 19 39.10

Calcium. 20 40.08

Answer 2

i prefer the attachment...❣️...