1
Q
Who discovered the periodic table of elements?
A
Dmitri Mendeleev
in the 1860’s
2
Q
What is a horizontal row of the periodic table called?
A
A period
3
Q
what is a vertical column of the periodic table
A
A group
4
Q
Whats the atomic number
A
The number of protons in the nucleus of an atom
5
Q
Whats the atomic mass
A
The mass of one atom of an element. It is the total of the masses of the protons and neutrons in an atom.
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