Pop chem quiz!

Sophia7X
Sun, 02 Dec 2012 12:04:25 +0000

It’s in the same period so you’re not gaining any shells (principle quantum number is not increasing), you’re just gaining a proton and an electron as Z goes up.
Because it’s possible to have a greater positive charge yet get bigger (when you’re adding in shells)! the protons are in the middle and electrons are surrounding them, the effect of the positive charge > effect of the negative charge. So the electron cloud is drawn in closer = atom decreases in size.