Question

can someone help me out with the question in above attachmentzkzk

thanks in advance
good night​

Answer 1

Answer:

a) This is because of arrangement of the modern periodic table is on the basis of Atomic number.

b) As, Hydrogen is the lightest element.It shows anomalous behavior with group 1 and group 17 properties,so it's position is not specifed till today.

Answer 2

GM....❤

oppa....❤

Can you see the above attachment!!! isn't it a different one!!!!.....but why has it come?.....

has it ever happenen with you .!?!!!....

I am scared will they do something with my account?!!!!!.........already they have deleted +650 now what they will do!????????!?!!.....

purple you....❤more than infinity.....❤