Question

Calcium is an element with atomic number 20.

What is the formula of its chloride?

Answer 1

The formula of the chloride of Calcium:

1. The atomic number of Calcium is$20$, so its electronic configuration will be $2,8,8,2$. The atomic number (Z) of chlorine is $17$, so its Electronic Configuration will be $2,8,7.$
2. The valency of Calcium is $2$ as it will lose $2$ electrons, and the valency of chlorine is $1$ as it will gain $1$ electron.
3. One Calcium atom will combine with$2$ chlorine atoms and will donate $1$electron to each atom.

Therefore, the formula of its chloride will be $CaC{l}_2$.