Magnesium combines with chlorine to form magnesium chloride during a synthesis reaction. A) Write the chemical equation for this reaction.
B) How many moles of magnesium chloride can be produced with 3 moles of chlorine?

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

The answer should be vaporization 

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts