Question

1. Table below represents the elements P,Q and R along with their atomic numbers. Which elements belong to I) same group II) same period? [3]



Elements P Q R

Atomic number 2 11 18​

Answer 1

Answer:

The elements of atomic number 5,9,13 belong to IIIA,VIIA,IIIA group respectively. Thus element of atomic number 5 & 13 have similar properties as they belong to the same group and elements of same group have similar properties. Hence answer is option B