Question

Which one of the following properties of an element can never be variable?

• A. Valency
• B. Atomic weight
• C. Equivalent Mass
• D. All the above

Answer 1

The correct option is B

Atomic weight

Atomic weight is a property of an element that never changes.

For example:

Atomic weight of Carbon = 12 g

But valency and Equivalent mass changes.

Valency depends on the number of electrons of an atom that are participated in a chemical reaction.

Equivalent mass depends on molar mass and number of equivalents used in a chemical reaction.