Your answer is D. 8
16 = 2^4
72 = 2^3*3^2
So you'll choose 2^3 = 8
Rubidium or strontium have larger a larger atomic radius since the further left on the periodic table you go, the larger the sizes of the atoms are. This trend can be explained through effective nuclear charge which explains how the further left and down you go, the less the atoms nucleus is able to pull in the electrons around it.<span />
Answer:
the first energy level is closest to nuclear the second energy level is a little farther away than the first
Ionic bonds are a metal and a non metal bond and a covalent bond is two no metals banded together.
