Potassium (k) has a charge of +1, and sulfur has a charge of –2. which best describes the compound they make? the chemical formula is k2s, and the name is potassium sulfide. the chemical formula is ks2, and the name is potassium sulfide. the chemical formula is k2s, and the name is sulfur potassium. the chemical formula is ks2, and the name is sulfur potassium.

The chemical formula is , and the name is potassium sulfide.

Explanation: For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here Potassium is having an oxidation state of +1 and sulfur has an oxidation state of -2. Thus they combine to form neutral [texK_2S[/tex].

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

The nomenclature of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

Hence, the name of is Potassium sulphide.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg