Question

Unknown element w has 2 valence electrons. Unknown element X has 7 valence electrons. Which formula shows the most likely outcome when elements w and X react

Answer 1

W + X2-->WX2

WX2 will be the compound formed from the reaction

Answer 2

Formula which shows the most likely outcome when elements w and X react is $wX_2$

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal

The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Thus w with 2 valence electrons will form a cation $w^{2+}$ and X with 7 valence electrons will form $X^{-1}$. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $wX_2$

Learn more about neutral ionic compound

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