Please answer this fast it's due in 20 minutes!! I don't need an explanation only answers

helloi think dog cat bunny dog cat bunny dog cat bunny

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.

answer; talc and gypsum;

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.