Question

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Answer 1

(a) Element A is a non metal because it may have 5 , 6 or 7 electrons in its valence shell. Therefore, to become chemically stable it needs 3 ,2 or 1 electrons respectively. After acquiring the respective electrons, the non metals become electronegative or anion i.e., with a negative valency .

(b) It is because it may be possible that element B may has a bigger atomic number than element C and so it has more number of electrons and more number of shells or orbits or energy levels.

(c) Element C has valency 1 due to the following reasons:

1. If element C is a metal , then it may has 9 valence electrons and to become chemically stable it has to lose one electron to complete its octet .

2. If element C is a non metal, then it may has 7 valence electrons and to become chemically stable it has to gain one electron to complete its octet.

Hope it helps.

Answer 2

Answer:

(a)Because it gain electrons .from other atoms

b)because of every layer of electrons just adds up.

c)because it outer most shell have only one valence electrons.

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