Elements in the same column of the periodic table share:
a. similar properties
b. the same number of protons
c. similar masses
d. the same number of electrons

immediately

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.

it takes on an electronical energy

football

explanation:

because it is