Why does the valency vary in going down a group?

Why does the valency vary in going down a group?

(a) Valency remains same on moving from top to bottom in a particular group. This is because the outermost electronic configuration of all the elements in a group remains same.

How does valency vary in going down a group and along a period?

In a group, the valency of an element remains constant while in a period it increases from left to right.

How does valence electrons change down a group?

Number of valence electrons increases. Decreases as you go down a group because electrons are close to the nucleus in smaller atoms making the attraction stronger.

How does the valency of elements vary a in going down a group and B in going from left to right of the periodic table?

i) The valency remains same in going down the group. b) Variation in valency: On moving from left to right in the periodic table, valency increases up to 4 and then decreases. Valency of a particular element is determined by the electrons present in the last shell.

Do electrons increase down a group?

It decreases as you go down the group. This is because the effective nuclear charge between the nucleus and the last / differentiating electron decreases due to increase in the radius . Thus tend to loose electrons. On moving down the group the charge decreases due to the increse in nuclear charge.

Do valence electrons increase or decrease across a period?

Valence electrons are the electrons in the outermost electron shell of an isolated atom of an element. In a period, the number of valence electrons increases as we move from left to right. However, in a group this periodic trend is constant, that is the number of valence electrons remains the same.

How valency varies in a group from top to bottom and left to right in a period give reason for both?

In a period, the number of valence electrons increases (mostly for light metal/elements) as we move from left to right side. However, in a group this periodic trend is constant, that is the number of valence electrons remains the same.

Why does elements in the same group have same valency?

Since, every group has elements with the same outer shell configuration. They have the same valency. Note: A similarity in the valency is also responsible for the chemical properties of the elements.

Which elements has the same valency?

(b) The number of valence electrons for all the elements in a group is the same. Therefore, the elements in the same group have the same valency. (c) For example, the elements of Group I such as sodium (Na) and potassium (K) contain only one valence electron, and so, the valency of elements of Group I is one.