Someone please help I will give brainliest

Option 1:

Cu(NO3)2 + Ag

hope this was helpful

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.

1. they vary with a higher number because boiling is way hotter than melting