What is the charge on the cation in the ionic compund sodium sulfide

Since this is an ionic compound, you must balance the charges so that overall charge of the compound is neutral. Sodium, an alkali metal, has a tendency to lose one electron. As a result sodium normally carries a positive one charge. Sulfur, a nonmetal, has a tendency to gain 2 electrons.

Explanation:

Sodium commonly forms a

+

I

ion.

Explanation:

And thus the chemical formula for sodium sulfide is

Na2S , i.e. two sodium ions are required to form a neutral salt with

S2-

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

answer carbon and three oxygen atoms;