Analysis
1. determine the water displaced
by the pencil by subtracting the
initial volume from the final
volume.
2. calculate the pencil's density by
dividing its mass by the volume of
water displaced.
3. compare the density of the pencil
to the density of water.

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.

Answerpotassium-argon dating