Question

HELP PLS !!!! :))Formula unit of Sr and CI Formula unit of AI and S

Answer 1

Answer : The formula unit of Sr & Cl is $SrCl_2$ and the formula unit of Al & S is $Al_2S_3$

Explanation :

Formula unit : it is defined as the lowest number ratio of ions of an elements in an ionic compound or covalent compound.

For the formula unit of Sr & Cl, two chloride ions$(Cl^-)$ are needed to neutralize the one strontium ion$(Sr^{2+})$.

For the formula unit of Al & S, three sulfide ions$(S^{2-})$ are needed to neutralize the two aluminium ion$(Al^{3+})$.

The formula unit of $SrCl_2$ and $Al_2S_3$ are shown below.