6 Questions
Which element shown in the table has the electronic configuration 2, 8, 1?
Na
What is the valency of elements in group 14?
4
Which pair of groups has elements with a valency of 3?
Group-13 and Group-15
What happens to the valency of elements as you move down a group?
It remains constant.
Which unit is used to measure atomic size?
Picometre (pm)
What is the relation between the valency and the nature of electrons (gain or loss)?
Group-17 elements gain 1 electron
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.
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.
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