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The mass number of an element whose atoms contain 18 protons, 22 neutrons and 18 electrons
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The mass number of an element whose atoms contain 18 protons, 22 neutrons and 18 electrons

User Achint
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Answer:

Argon has the chemical formula Ar. Argon has 18 protons and 22 neutrons in its nucleus giving it an Atomic Number of 18 and an atomic mass of 40. Argon is a Noble Gas. Argon is a gas at room temperature.

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User Valera Kolupaev
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