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its valency is 1. Question 4. The position of three elements A - Giving reason, explain the following: (a) Element A is a metal. (b) Element C has a larger size than B. (c) Element B has a valency of 3. 15. Define valency. Ans : The combining power of an element to attain the noble gas configuration is called valency. 67. If the valency of an element X is 3, then write the chemical formula of its oxide. Valency is the number of electrons gained or lost in order to form ions. Valence electrons can be deduced from the atomic number of elements how can you do this this can.
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Answer (1 of 2): 1. Hydrogen +1 2. Helium 0 3. Lithium +1 4. Beryllium +2 5. Boron +3 6. Carbon +4 / -4 7. Nitrogen +5 / -3 8. Oxygen -2 9. Fluorine -1 10. Neon 0 11. Sodium +1 12. Magnesium. Question 13: How does the valency of elements vary (a) in going down a group, and (b) in going from left to right in a period of the periodic table? Answer: (a) Valency remains the same in a group. (b).
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