Question

valency of group 1,2,13,14,15,16,17 and 18

Answer 1

Answer:

Group 1- 1

Group 2- 2

Group 13- 3

Group 14- 4

Group 15- 3

Group 16- 2

Group 17- 1

Group 18- 0 as they are stable and their octet or duplet is complete so they have valency zero.

Explanation:

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Answer 2

Answer:

1. Group 1: 1
2. Group 2: 2
3. Group 13: 3
4. Group 14: 4
5. Group 15: 3
6. Group 16: 2
7. Group 17: 1
8. Group 18: 0

Explanation:

Valency can be defined as the combining ability of an atom. It is related to the number of valance electrons. It sometimes is equal to the number of valence electrons and sometimes it is the number of electrons that are required to complete the octet. It depends on the number of valence electrons. It is common for a group since they have the same number of valence electrons.

1. Group 1: The number of electrons in its valence shell is 1. So it donates one electron to become stable. So common valency is 1.
2. Group 2: The number of electrons in its valence shell is 2. To become stable it usually donates 2 electrons. Hence common valency is 2.
3. Group 13: number of valence electrons in group 13 is 3. Hence their common valency is 3.
4. Group 14: All elements in group 14 have 4 electrons in their valence shell.  They utilize these electrons to attain the octet. Hence valency of this group is 4.
5. Group 15: This group has 5 valence electrons in common. They need 3 electrons to attain octet. Hence their common valency is 3.
6. Group 16: This group has 6 valence electrons in common. They need 2 electrons to attain octet. Hence their common valency is 2.
7. Group 17: This group has 7 valence electrons in common. They need 1 more electron to complete the octet. Hence their common valency is 1.
8. Group 18: Their number of valence electrons is 8. Hence their octet is complete. Therefore their valency is 0.