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How many elements are on the periodic table?
About 100.
How are elements arranged in the periodic table?
They are laid out in order of ascending atomic number/number of protons.
What are columns on the periodic table called?
Groups
What are rows on the periodic table called?
Periods
What do elements in the same group on the periodic table have in common?
They have similar properties.
What does the group on the periodic table tell you about an element?
The amount of electrons in the outer shell of the atom.
What does the period on the periodic table tell you about an element?
The number of electron shells each atom has.