Element O B C N Be Li Atomic radius (pm) 66 88 77 74 111 152 By referring to the modern periodic table find out the periods to which the above elements belong.

The elements like lithium, beryllium, boron, carbon, nitrogen, oxygen belongs to the second period of the modern periodic table.

Element O B C N Be Li Atomic radius (pm) 66 88 77 74 111 152 Arrange the above elements in decreasing order of their atomic radii.

The atomic radii is decreases on moving from left to right in a period of the periodic table. As moving from left to right in a period, the atomic number of elements increases by one. As atomic number increases, nuclear charge also increases. Because of this increased nuclear charge, the electrons are attracted strongly towards the nucleus and hence the atomic size decreases. Arrangement of elements in decreasing order of atomic radius Li Be B C N O Atomic radius (pm) 152 111 88 77 74 66

Element O B C N Be Li Atomic radius (pm) 66 88 77 74 111 152 Does this arrangement match with the pattern of the second period of the modern periodic table?

The arrangements match with the second period because all the elements given in this series have two energy shells or orbits present in their atoms.

Element O B C N Be Li Atomic radius (pm) 66 88 77 74 111 152 Which of the above elements have the biggest and the smallest atom?

The lithium is the biggest atom and the oxygen is the smallest atom in the given list. The size of the atom depends upon the distance between the central nucleus to the outermost orbit. In a period from left to right atomic size decreases.

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 10: 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 10: Use your brain power

Attempt the practice questions on Chapter 2: Periodic Classification of Elements, Exercise 10: 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.