Perform the following operation and express the answer in scientific notation. 3.5x102 x 8.0x10-2 [ ? ]x10[?]​

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.

he would use the colour black