Balance the following: ___C + ___S → ___CS2

1C + 2S > 1CS2

in order to make the reactants carbon and sulfur be equal to the product Carbon 2 Sulfur, we need to have 2 sulfurs on the left side so that both sides have 1 carbon and 2 sulfurs

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.