# How does the valency vary in a period on going from left to right class 10?

## How does the valency vary in a period on going from left to right class 10?

In period from left to right, the valency initially increases for first four elements of the period and then decreases till the end. The number of electron present on the outermost orbit of the element is called valence electron.

How does the valency vary in a period from left to right and group from top to bottom?

(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 across a period and down the group?

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

What is valency how it varies in a period?

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Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.

#### Is valency same in the same group?

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.

How does valency varies in a group give reason?

The valency of an element is dependent on the number of electrons in the outermost shell of the electron. In a group all constituting elements will have the same valency because they all have the same number of electrons in the outer shells. Across the a period, the number however increase by 1.

## How does it vary in a group and period?

In general, the atomic radius decreases as we move from left to right in a period with an increase in the nuclear charge of the element. The atomic radius increases when we go down a group because of the addition of an extra shell.

How the atomic size vary as we move from left to right in a period?

Experiments have shown that the first case is what happens: the increase in nuclear charge overcomes the repulsion between the additional electrons in the valence level. Therefore, the size of atoms decreases as one moves across a period from left to right in the periodic table.

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

Down the group, valency remains the same as it depends upon valency shell electrons which remain the same on moving down the group and atomic size increases because a new shell is added.

When we go from left to right in a period?

When we move from left to right across a period, the chemical reactivity of elements decreases and then increases. The number of valence electrons increases from 1 to 8 when we move from left to right across a period. The atomic size decreases on moving from left to right in a period.

#### Which has same valency?

Elements In The Same Group Have Equal Valency. This is because these elements comprise the same number of electrons in the outermost shell or its valence shell. As the valence depends upon the valence electrons, they have the same valence.

How does valency vary across the periodic table?

Atomic size decreases across a Period from left to right as we face the Table, but INCREASES down a Group, a column of the Periodic Table. Atomic size is influenced by (i) nuclear charge, Z , and by (ii) shielding by other electrons. Incomplete electronic shells shield nuclear charge VERY ineffectively.

## How does valency vary when we move from left to right?

How does valency vary when we move from left to right through a period? Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.

How does the number of valence electrons change across a period?

Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.

### How many valence electrons does hydrogen and helium have?

The first element hydrogen has one valence electron and helium has two valence electrons. On moving from left to right in a period, valency increases from 1 to 4, then falls to one and ultimately to zero in the last group. Is there an error in this question or solution?

What is the valency of oxygen and hydrogen?

Valency first increases from 1 to 4 and then decreases from 4 to 0 along a period from left to right. Valency with respect to hydrogen it starts from 1, 2,3,4,3,2,1 f or 7 groupsrespectively. But valence with respect to oxygen, valency is 1,2,3,4,5,6,7 for seven groups respectively