This is science?

Question

Determin the identy of the following element described below.

1.This metal is the mos reactive metal in its period and cannot be found uncombined in nature. Each atom of the element contains 19 protons.

2.This shows the percentages of elements in the earth's crust.
46.6% O
27.7% Si
8.1% Al
5.0% Fe
3.6% Ca
2.8% Na
2.6% K
2.0% Mg
1.6% Other

Excluding the"other" category, what percentage of the earth's crust is
a.alkali metals?
b.alkaline earth metals?

Answer 1

alkaline earth metals-Mg,Ca=2.0+3.6=5.6%
alkali metalsNa,K=2.8+2.6=5.4%
(by the way we had the question in our science class.Sodium is the most reactive metal)

Answer 2

Potassium

(not the most reactive, Francium is)

2. Check the period table to work it out

Answer 3

There's a periodic table here - http://www.webelements.com/