Periodic Table
what is the atomic number for hydrogen
what is 1
is an atom big or small
what is small
what is the atomic symbol for Boron
what is B
what does P.E.N. stand for
what is protons, electrons, and atomic number
how many groups are on the periodic table
what is 18
how many electrons can fit in the first shell of an atom
what is 2
how many periods are in the periodic table
what is 7
are there atoms in the human body
what is yes
who created the periodic table
who is Dmitri Mendeleev
how many electrons fit in the fifth shell of an atom
what is 50