Argon is a non metal element. Mass number of it is 40.
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The answer is 3
Boron - B - Group IIIThe atomic number is 5.The mass number is 11.
Zink is a meta element. Atomic mass of it is 65. Atomic number of it is 30.
Argon is a period 3 element.
18 represents the atomic number for Argon. It is the number of protons and of electrons in an argon atom and defines its position in the periodic table.