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Properties of Atoms and the Periodic Table

Across
Has no charge
Has a negative charge
A liquid at room temperature
Former of the periodic table
A metal
Makes up protons
The center of an atom
A gas
The mass of an atom
Same element with differing number of neutrons
Where electrons are found
Down
A nonmetal
Have same number of outer electrons
In the Lanthanide series
Like charges
A metalloid
Has a positive charge
An accelerator
Be
Has all the same atoms
The smallest particle of an element
A stable gas
Vertical columns
Horizontal rows
Opposite charges