18 protons
22 neutrons
18 electrons
how do i draw this ? please help ASAP.

Explanation:

You need to remember a few things if you want the answer to this question...

Therefore you need to draw a atom that is similar to this:

Hope this helps.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.