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Question

An element X has mass number 35 and the number of neutrons in its atom is 18.
(a) To which group of the periodic table element X belongs?
(b) To which period of the periodic table element X belongs?
ā€‹(c) What will be the formula of chloride of element X?

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Solution

The mass number of element X = 35
Number of neutrons of element X = 18

The mass number of an element equals the total number of protons and neutrons present in it.
Mass number = number of protons + number of neutrons
35=number of protons+18Number of protons=35-18Number of protons=17
And we know, number of protons = number of electrons
So, the number of electrons = 17

(a) Electronic configuration of element X will be 2, 8, 7.
So it belongs to the halogen family, 17 group.

(b) It belongs to 3rd period of the periodic table.

(c) The formula of chloride of element X will be XCl.

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