1 What is the atomic number of the element located in group

1.) What is the atomic number of the element located in group 16, period 2 of the periodic table?

2.) If a new element were discovered and it was found to form 1 ions, in which group would you place it in the periodic table?

Solution

1) periodic table have 18 groups(column) and 7 periods(rows).

So, here group 16 belongs to gases like oxygen, sulfur, Se, Te, Po.

Now, count down from top of period upto period 2.

Period 2 of group 16 would comes out to be oxygen.

NOTE: - group 16 doesn\'t have any element in group 1.

-And period 1 contains only H and He.

-(Please refer to a periodic table while solving out this question)

2) we would place it in group VII A or the halogens family

because only halogens forms ions with a -1 charge.
And, The valence shell structure of the VII A elements is
s2p5 ie these these elements are short of only one electron in order to achieve the stable electron structure s2p6.
of the VIII A or noble gases.
This causes the halogens family to commonly have a negative one charge.