Question

Identify the element in Period 3 of the Periodic Table that reacts with oxygen to form an ionic compound represented by the formula X2O.

Answer 1

the metal compound in period 3 is a group 1 metal - Na.

the compound is Na2O, the base annyhdride of NaOH :)

Answer 2

Answer:

Sodium (Na)

Explanation:

An ionic compound is formed by a bond between a metal and a nonmetal element. To form its formula, we first represent the metal atom and then the nonmetal atom in their ionic formulas, and then we change their charges, without the signal.

So, in the ionic compound X₂O, the ions must be:

$X^+$ and $O^{-2}$.

The element X loses one electron to be stable, so it's on group 1. Searching in the Periodic Table, this element is Sodium (Na).