With reference to period 3 of the periodic table-State:

1. The type of bonding of the element with electronic configuration 2, 8, 7.

2. The formula of the chloride of the element with electronic configuration 2, 8, 4.

3. The nature of the oxide of the alkaline earth metal in the period.

4. The number of electrons in the penultimate shell of the element with valency
-1.

5. The electronic configuration of the element whose hydroxide is a weak base.

1. The element belongs to group 17(7A) and is Cl.  Cl forms ionic or electrovalent bond by accepting one electron from metals.  With another non-metal it forms         covalent bond by sharing electrons.
2. The element is Si with a valency of 4. Formula of its compound with Chlorine is SiCl4.
3. Alkaline earth metal in the period is Ca. Its oxide CaO is basic in nature.
4. Element is Cl and it has 8 electrons in the penultimate shell.
5. Al forms a hydroxide that is a weak base, Electronic configuration of Al is 2,8,3

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