The shape would be the answer if it is taking up space it's a liquid if if it stays in the area of space it's a solid
It is an approximation of its mass number. Each isotope of an element has a different mass number.
Answer:
Generally, the atomic radius decreases across a period from left to right and increases down a given group. ... This causes the atomic radius to decrease. Moving down a group in the periodic table, the number of electrons and filled electron shells increases, but the number of valence electrons remains the same.
