A)which element will only form covalent compound?
B)which element is a metal with valency 2?
C)which element is non-metal with valency 3
D)out of D and E which one has a bigger atomic radios and why?
E)write a common name of the family of element C and F.
Answers
(i) Element E is present in Group 14. It has a valency of four. Thus, among the given elements, it forms only covalent compounds.
(ii) Element B is present in Group 13. Thus, among the given elements, it is a metal with valency three.
(iii) Element C is present in Group 15. It is a non-metal with five valence electrons. Thus, it has a valency of three.
(iv) Elements B and C are present in period 2 of the periodic table. On going from left to right in the periodic table, the atomic radii of elements decrease due to increase in effective nuclear charge that pulls the valence electrons close to the nucleus. Thus, out of B and C, the atomic radius of B is bigger.
(v) Elements D and F are present in Group 18 of the periodic table. They belong to the family of inert/noble gases.
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E, D, B, D, Noble Gases
Explanation:
- A)which element will only form covalent compound --------------------- E
- B)which element is a metal with valency 2------------------------------------D
- C)which element is non-metal with valency 3--------------------------------B
- D)out of D and E which one has a bigger atomic radios and why?---D
- D has bigger atomic radius. The atomic radius decreases in moving from left to right along a period. This is due to an increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size of the atom.
- E)write a common name of the family of element C and F.-----------Noble gases
- Noble gases: The other name of noble gases is Inert Gases.
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