Question

The atomic number of three elements X, Y and Z are 9, 11 and 17 respectively. Which two of These elements will show similar chemical properties? Why?

Answer 1

Answer:

X and Y

Explanation:

Because they have same number of valence electrons in their groups and Also, they form positively charged ions by loss an electron.....

Answer 2

Answer:

The electronic configuration of the three elements is as follows:-

X- 2,7

Y- 2,8,1

Z- 2,8,7

Since X and Z both have 7 valence electrons that means both belong to group 17 and are halogens therefore X and Z will show similar chemical properties.