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Number of valence electrons in Cl- ion are:
(a) 16
(b) 8
(c)17
(d) 18.
Correct Answer: (b) 8.
Explanation:
Atomic number: The atomic number of an element is equal to the number of protons in the nucleus of its atom. e.g., Oxygen has 6 protons, hence, atomic no. = 6.
Mass number: The mass number of an atom is equal to the number of protons and neutrons in its nucleus.
Nucleons = number of protons + number of neutrons.
To find out the number of valence electrons in Cl- ion,
The atomic number of chlorine is 17. The electronic configuration of chlorine is,
Cl (Z= 17) = 1s2 2s2 2p6 3s2 3p5
Hence, it has 2 electrons in its innermost shell, 8 electrons in its second shell, and 7 electrons in the outer-most shell, respectively.
Therefore, there are 7 valence electrons in the chlorine atom.
Chlorine Ion (Cl⁻) has 18 electrons in its shell. So there are 8 valence electrons.
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