Question

How many groups are there in the Modern Periodic Table'?
1
3(e) Which one of the following statements is not correct about the
Modern Periodic Table'?
1
(A)
It is based on atomic masses.
(B)
(C)
The position of isotopes is not disputed. -
The position of isotopes is easily assigned..
It separates metals from non-metals.-
(D)
3(d) 'The cause of periodicity of properties of elements is.
(A) Increasing atomic radius
(B) Increasing atomic mass
(C) Increasing nuclear charge
The recurrence of similar outer electronic configuration
Answer question numbers 4(a) - 4(d) on the basis of your understanding
and the related studied concepts :​

Answer 1

Answer:

1) There are 18 groups in modern periodic table.

3(e) (A) It is based on atomic masses.

3(d) (D) The recurrence of similar outer electronic configuration.