Question

Which statement about the Periodic table is correct ?

A Elements in the same group have the same number of electron shells.

B It contains elements arranged in order of increasing proton number.

C Metals are on the right and non metals on the left.

D T he most reactive elements are at the bottom of every group.​

Answer 1

Answer:

B.

Explanation:

elements are arranged in increasing order of atomic number i.e. number of protons.

Answer 2

Answer:

B

Explanation:

proton no.= atomic no.(Z)

in modern periodic table elements are arranged in the order of increasing atomic no. and since atomic no.= proton no., option B is correct

A is incorrect as down a group no.of shells increase

no. of shells remain same in a period

C is incorrect as metals are placed on left and non metals on right.

D is incorrect as: for eg. take fluorine the most reactive non metal has been placed in second period( which of course is not the bottom)