Answer:
I think that it is II and IV.
I'm not positive so don't count on it, but i'm bout to be in 11th grade and I remember my chemistry teacher showing us this video so there is a video on you tube where he explains in.
Explanation:
I'm sorry if this is useless, but lemme know what you get for the answer. Good Luck:)
A period is the horizontal row of elements in the periodic table and they are numbered from one to seven. In the same period, atomic number increases from left to right. Elements in the same period have the same number of electron energy levels and they transition from a metal to noble gas.
<span>What particles make up most of the mass of an atom? Protons and neutrons
</span><span>What takes up most of the volume of an atom? Electrons</span>
The answer is C but i might be wrong
