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  • The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? (a) 13 (b) 10 (c) 14 (d) 16

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

(a) 13

(b) 10

(c) 14

(d) 16

Answers (1)

Answer: B

Mass number (A) of the atom = 27
Number of neutrons in the atom = 14
Number of protons in the atom = 27-14 =13
Number of electrons in the atom = 13

Therefore, this element is aluminum (Al).
Number of electrons in the Al atom = 13

Number of electrons in the Al^{3+} ion = 13 - 3 = 10
As it is formed from the neutral atom by loss of 3 electrons.
Number of electrons in ion with 3 positive charges = 13 - 3 = 10

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