Es momento de practicar, realiza la configuración electrónica para los elementos cuyo Z= 12, 31, 50 y 83. Plis,

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

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.