Which physical property allows a mixture of sand, rocks, and gravel to be separated by a sieve? Answer choices:

A:Size
B:Solubility
C:Shape
D:Magnetism

HELP PLEASE this is science not chemistry

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

what does the table look like