Question

arrange the following elements of different periods as per the guidelines given below ​

Answer 1

Answer:

1)atomic radii decrease on moving from left to right of a period.

2) ionisation potential decrease down a group.

3) electronegativity increases down a group.

4)electron affinity increases across a period.

5) metallic character increases down a group, non metallic character increases across a period, noble gas group 18