Any one who answer these questions gets 20 pts.
which is the largest category of elements on the periodic table?
a. metals
b. metalloids
c. nonmetals
d. noble gases

what do the atoms of elements in the same period have in common?
a. they have the same number of protons.
b. they have the same number of neutrons.
c. they have the same number of electron shells.
d. they have the same number of electrons in their outermost shells.

approximately how many elements are there that combine chemically in a great number of ways to produce compounds?
a. 25
b. 50
c. 75
d. 100

what are the rows of the periodic table of the elements also called?
a. groups
b. periods
c. families
d. columns