Question

for an element X it is given that atomic number is 17 and mass number is 35 what will be the formula of the compound formed between X Above and why having valency 3​

Answer 1

Answer:

Mass number of element is 35

Number of neutrons= 18

Formula to find number of protons:

Mass number = number of protons + number of neutrons.

35=× +18

×=35 - 18

X=17.

Number of protons =17 and number of electrons also will be 17 as atom is electrically neutral.

Hence Element is chlorine

Electronic configuraton:

1s2 2s2 2p6 3s2 3p5

Group number= 17

Period number =3

Valency =1

Hope it helps you☺☺