Element K Na Rb Cs Li Atomic radius (pm) 231 186 244 262 152 By referring to the modern periodic table find out the group to which above the elements belong

The elements like potassium, sodium, rubidium, caesium, lithium belongs to the first group of the modern periodic table. All elements in group 1 have 1 valence electron, so they have a valency of + 1 as they will tend to give up 1 electron.

Element K Na Rb Cs Li Atomic radius (pm) 231 186 244 262 152 Arrange the above elements vertically downwards in increasing order of atomic radii.

As we move from top to bottom in the group, the atomic radius will be increased, because the electron enters into a new sub-shell. Elements Atomic radii i) Li 152 ii) Na 186 iii) K 231 iv) Rb 244 v) Cs 262

Element K Na Rb Cs Li Atomic radius (pm) 231 186 244 262 152 Does this arrangement match the pattern of the group 1 of the modern periodic table?

The arrangement of elements in the increasing order of the atomic radius matches the group 1 of the modern periodic table. Elements Atomic radii i) Li 152 ii) Na 186 iii) K 231 iv) Rb 244 v) Cs 262

Element K Na Rb Cs Li Atomic radius (pm) 231 186 244 262 152 Which of the above elements have the biggest and the smallest atom?

The caesium is the biggest atom, and the lithium is the smallest atom. From top to bottom, the atomic radii of an atom will be increased. The atomic radii of caesium is 262 and the atomic radii of lithium is 152 .

What is the periodic trend observed in the variation of atomic radii down a group? Element K Na Rb Cs Li Atomic radius (pm) 231 186 244 262 152

The atomic size of an atom goes on increasing in the group from top to bottom because one shell is added to every next element.

E M B I B E

Science and Technology Standard Ten Part - 1>Chapter 2 - Periodic Classification of Elements>Use your brain power

Maharashtra Board Solutions for Chapter: Periodic Classification of Elements, Exercise 11: Use your brain power

Author:Maharashtra Board

Maharashtra Board Science and Technology Solutions for Exercise - Maharashtra Board Solutions for Chapter: Periodic Classification of Elements, Exercise 11: Use your brain power

Attempt the practice questions on Chapter 2: Periodic Classification of Elements, Exercise 11: Use your brain power with hints and solutions to strengthen your understanding. Science and Technology Standard Ten Part - 1 solutions are prepared by Experienced Embibe Experts.