Question

an element y belong to group 1 find formula for its oxide​

Answer 1

Answer:

y₂O

Explanation:

Elements belonging to group 1 have valency as 1. Oxygen has a valency of 2.

By criss-cross method, we want two elements of 1st group and one oxygen.

So the formula is 'y₂O'.

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Answer 2

If the element belongs to group 1

then,

         valency of element y = +1

i.e element y will give one electron to form compound

and valency of oxygen = -2

i.e oxygen wants to gain to electron.

             element-y                           oxygen

                   1                                          2

cross multiplying

so,

The oxide of  element-y = y₂O

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