a) Which elements is are non metal valency ?
b) Which element will form only covalent bonds ?
c) Out of J, B, I which has the largest atomic size ?
d) Which is least reactive among all ?
e) Tol which family does F and H belong ?
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Answers
Answer:
b) Element E is present in Group 14. It has a valency of four. Thus, among the given elements, it forms only covalent compounds.
c) Atomic size increases down the group as the new shell is added successively while this atomic size decreases across the period. Mg is an alkaline earth metal present in group 2 while others are present on extreme right so Mg has the largest size.
d) Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
1. "B" element is non-metal with valency 2. "B" element, in this case, is oxygen.
The atomic number of oxygen is 8 and its electronic configuration is 2, 6.
There are 6 electrons in the valence shell, so 2 electrons are required to complete its octet.
So it accepts 2 electrons to complete its octet. So, it is a non-metal.
2. Element E is present in Group 14. It has a valency of four. Thus, among the given elements, it forms only covalent compounds.
3. francium is the largest.
4.copper, gold, and silver are the least reactive.
5 H and F element belongs to Noble gas family