(a) The atomic number of sodium is 11. What is the number of electrons in Na⁺?
(b) The atomic number of chlorine is 17. What is the number of electrons in Cl⁻?

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Solution

(a) Na⁺ contains one less electron than the Na atom (11 electrons). So it contains 11 − 1 = 10 electrons.
(b) Cl⁻contains one more electron than the Cl atom (17 electrons). So it contains 17 + 1 = 18 electrons.

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(Atomic number of Na=11; 0=8)

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(a) The atomic number of sodium is 11. What is the number of electrons in Na+? (b) The atomic number of chlorine is 17. What is the number of electrons in Cl−?

(a) Na+ contains one less electron than the Na atom (11 electrons). So it contains 11 − 1 = 10 electrons.(b) Cl− contains one more electron than the Cl atom (17 electrons). So it contains 17 + 1 = 18 electrons.

(a) The atomic number of sodium is 11. What is the number of electrons in Na⁺?
(b) The atomic number of chlorine is 17. What is the number of electrons in Cl⁻?

(a) Na⁺ contains one less electron than the Na atom (11 electrons). So it contains 11 − 1 = 10 electrons.
(b) Cl⁻contains one more electron than the Cl atom (17 electrons). So it contains 17 + 1 = 18 electrons.