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The Periodic Table

Across
A substance composed of two or more elements
Number eight on the periodic table, we breath e it
Group 1 of the periodic table
Sum of the number of protons and neutrons
The horizontal rows on the periodic table
An electron located in the outermost shell of an atom
A bond between two or more metallic elements
A substance made of only one type of atom
It has no charge
The vertical columns on the periodic table
The smallest particle of an element
Down
A list of elements organized according to atomic number and properties
Krypton, helium, neon, argon
The number of protons in an element
An element that has the same number of protons but a different number of neutrons
It has a negative charge
The chemist that created the periodic table
It is commonly known to fill up balloons
All of the atoms in period 3 have _ electron shells
It has a positive charge and is found in the nucleus