Question

name the first twenty elements with their atomic masses and valency ..​

Answer 1

Answer:

Element - Atomic Mass - Valency

Hydrogen - 1.0079 g/mol - 1

Helium - 4 g/mol - 0

Lithium - 6.94 g/mol - 1

Beryllium - 9.01 g/mol - 2

Boron - 10.81 g/mol - 3

Carbon - 12.01 g/mol - 4

Nitrogen - 14.01 g/mol - 3

Oxygen - 16 g/mol - 2

Fluorine - 19 g/mol - 1

Neon - 20.18 g/mol - 0

Sodium - 22.49 g/mol - 1

Magnesium - 24.305 g/mol - 2

Aluminium - 26.98 g/mol - 3

Silicon - 28.09 g/mol - 4

Phosphorus - 30.97 g/mol - 3

Sulphur - 32.07 g/mol - 2

Chlorine - 35.45 g/mol - 1

Argon - 39.95 g/mol - 0

Potassium - 39.10 g/mol - 1

Calcium - 40.08 g/mol - 2

Answer 2

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