Write the balanced chemical equations for the following reactions. Include states of matter.

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.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )