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The Periodic Table

Across
The atomic number is the number of ____ in the nucleus.
Group 1 elements are the _____ metals.
The element that has 35 protons in its nucleus.
Group 18 elements are the _____ gases.
Man who invented the periodic table.
The element that has 36 electrons.
Group 17 elements.
Down
An atom of the same element with a different number of neutrons.
Electrons in the outermost shell are called _____ electrons.
The element that has an atom mass of 65.41.
Each column in the periodic table is called a _____.
Each row in the periodic table is called a _____.
Atomic Mass is the number of protons plus the number of ______.
The maximum number of electrons that the second energy level can hold.