Question

Which property of an element is not variable?

• A. Valency
• B. Atomic mass
• C. Equivalent mass
• D. None of these

Answer 1

The correct option is B Atomic mass

Valency of an element can be variable as in transition metals, $C{u}^{+},C{u}^{+2}$.
Also, Equivalent mass $=\frac{molarmass}{valency}$. So, it is also variable as valency is variable.
But, Atomic mass of an element is constant as it is the mass of total particles of element (proton, neutron and electron).