Question

The formula of a compound between any group $1$ element $M$ and any group $17$ element $X$ will be:

• A. $MX$
• B. $M_{2}X$
• C. $M{X}_2$
• D. $M{X}_3$

Answer 1

Answer: (A)

$MX$

The formula of a compound between any group $1$ element $M$ and any group $17$ element $X$ will be $MX$. An example is sodium chloride $NaCl.$ $M$ will lose one electron to complete its octet. It will form $M^{+}$ ion. $X$ will gain one electron to complete its octet. It will form $X^{-}$ ion. One $M^{+}$ ion will combine with one $X^{-}$ ion.