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Questions and Answers
Which element shown in the table has the electronic configuration 2, 8, 1?
Which element shown in the table has the electronic configuration 2, 8, 1?
What is the valency of elements in group 14?
What is the valency of elements in group 14?
Which pair of groups has elements with a valency of 3?
Which pair of groups has elements with a valency of 3?
What happens to the valency of elements as you move down a group?
What happens to the valency of elements as you move down a group?
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Which unit is used to measure atomic size?
Which unit is used to measure atomic size?
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What is the relation between the valency and the nature of electrons (gain or loss)?
What is the relation between the valency and the nature of electrons (gain or loss)?
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Study Notes
Down the Group
- The valency of elements in a group remains constant because they have the same valence electrons.
- The group number can be used to determine the valency of an element.
Valency of Elements in Different Groups
- Group 1 elements have a valency of 1, which means they lose one electron to achieve stability.
- Group 2 elements have a valency of 2, which means they lose two electrons to achieve stability.
- Group 13 elements have a valency of 3, which means they lose three electrons to achieve stability.
- Group 14 elements have a valency of 4, which means they share four electrons to achieve stability.
- Group 15 elements have a valency of 3, which means they gain three electrons to achieve stability.
- Group 16 elements have a valency of 2, which means they gain two electrons to achieve stability.
- Group 17 elements have a valency of 1, which means they gain one electron to achieve stability.
- Group 18 elements have a valency of 0, which means they neither gain nor lose electrons to achieve stability.
Atomic Size
- Atomic size is measured in terms of atomic radius.
- Atomic radius is the distance between the centre of a nucleus and the outermost shell.
- Atomic radius is measured in picometres (pm), with 1 pm equal to 10^-12 meters.
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Description
This quiz covers the properties of Group 1 elements, including their valency and electron configuration. It also explains why the valency remains constant down the group.
