Question

With reference to period 3 of the periodic table — State :
(a) The type of bonding of the element with electronic configuration 2, 8, 7.
(b) The formula of the chloride of the element with electronic configuration 2, 8, 4.
(c) The nature of the oxide of the alkaline earth metal in the period.
(d) The number of electrons in the penultimate shell of the element with valency -1.
(e) The electronic configuration of the element whose hydroxide is a weak base.

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Answer

(a) The element with electronic configuration 2, 8, 7 will form ionic bonds with metals and with non-metal it will form covalent bond.

(b) The element with electronic configuration is 2, 8, 4 is Si and with chloride it forms SiCl4.

(c) The alkaline earth metal in the period 3 is Mg and it’s oxide is basic in nature (i.e. MgO is basic is nature).

(e) The number of electrons in the penultimate shell of the element with valency -1 is 8.

(e) The element is Magnesium and electronic configuration is (2, 8, 2)

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