Question

1 to 30 elements with mass numbers

Answer 1

element mass number

Hydrogen - 1
Helium -4
Lithium-6.94
Beryllium-9.01
Boron-10.81
Carbon-12.01
Nitrogen-14.01
oxygen-15.99
Fluorine-19
Neon-20.18
Sodium-22.99
Magnesium-25.31
Aluminium-26.98
Silicon-28.09
Phosphorus-30.97
Sulphur-32.07
Chlorine-35.45
Argon-39.95
Potassium-39.10
Calcium-40.08