Question

the atomic number of an element is 17 what is its valancy
plss ans me​

Answer 1

                          Answer:

So the valency = 8-7 = 1. Its valency is 1 and it is a non-metal and it is present in the 17th group.

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Answer 2

Answer:

Explanation:

Atomic No. = No. of Electrons = No. of Protons

So, we can conclude that the element has 17 electrons in total.

Now, Electronic Configuration of the element :

K         L          M

2          8          7

That is, the element is configured as (2,8,7).

♦ Thus, valence electrons (electrons in outermost shell) = 7

The element can be stable by being octant, i.e, having 8 electrons in valence shell.

For that, it must gain 1 more electron.

Therefore,Valency = 1