Question

Q1. Amongst lithium potassium which is larger in size why ?

Q2. What is the cause of periodicity amongst elements in Modern periodic table?

Q3. Why are anions bigger than their parent atoms

Q4. How does E.C of the following elements predict the group and period to which they belong ? (GIVE REASONS)

Q5. What similarity do u observe in ..

a) Elements belonging to same period .

b) Elements belonging to same group .

Answer 1

potassium is bigger as we go down the group no. of shell increase so size increase

Answer 2

1.Potassium has a larger size as Atomic size (Atomic radius) increases from up to down along each column(group) of the periodic table. For example, in the first group, the Atomic radius trend from smallest to greatest is: H (smallest) -- Li  -- Na -- K -- Rb -- Cs -- Fr (greatest).

Reason is, the increasing energy level (increases from n=1 to n=7) causes the shielding effect increase dramatically. And since the size of atom is mostly consist of electrons, more energy level is filled, the larger the atom will be.)