Question

$75$% of element M exists as ${}^{214}M$ and $25$% of it exists as ${}^{210}M$. Find the atomic weight of element M in amu?

• A. $211$
• B. $214$
• C. $213$
• D. $212$
• E. $85$

Answer 1

The correct option is C $213$

The atomic weight of element M in amu $=\frac{75\times 214+25\times 210}{75+25}=213amu$