________ shell is the last shell of the atom.

24
Cr
52
The number of neutrons in chromium is _____.

The subshells of an atom are _, _, _, and _.

30
Zn
65
The number of protons and electrons in zinc is _____.

Each __________ can contain less than or equal to 2 electrons.

If boron had an isotope, what type of isotope would it be?

Silicon contains ___ shells

Platinum-200 is _________

Nitrogen has 7 electrons. The electron configuration is ______.

Barium-150 is an isotope. It has 56 protons and electrons. It has ____ neutrons.