Question

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 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

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Answer 1

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HERE IS YOUR ANSWER:-

1. either ionic or covalent bond (chlorine)
2. XCl4 ( Silicon)
3. basic (metals form basic oxides)
4. Take example of flourine, it contains 7e- in valence shell, thus penultimate shell will have 2.
5. 2,8,2 (magnesium)

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Answer 2

Answer:

1. Covalent

2. SiCl4

3. Basic nature

4. For Cl, 8

5.2,8,2