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The mass number of argon is 40 . Which one of the following statements is correct?

Options

  1. AThe number of protons in argon is 22.
  2. BThe number of neutrons in argon is 18.
  3. CThe number of electrons in argon is 18.
  4. DThe sum of numbers of protons and electrons in argon is 40 .

Correct answer

C. The number of electrons in argon is 18.

Step-by-step solution

Argon is monatomic noble gas. Atomic number of Argon is 18. No. of proton of Ar = No . Of electron =18 Number of neutron = Mass number - number of proton 40-18=22

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