EASY
10th CBSE
IMPORTANT
Earn 100

What are groups and periods in the periodic table?

Important Questions on Periodic Classification Of Elements

MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 1
State two main properties of elements on which Mendeleev's periodic classification was based. Why could no fixed position be assigned to hydrogen in his periodic table.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 2
State Mendeleev's periodic law. Write two achievements of Mendeleev's periodic table.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 3

Identify and name the metals out of the following elements whose electronic configurations are given below. (He, Li, Na, K, Ca, Mg)

(a) 2, 8, 2 (b) 2, 8, 1 (c) 2, 8, 7 (d) 2, 1

HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 1
Which group of elements could be placed in Mendeleev’s periodic table without disturbing the original order? Give reason.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 2
Give an account of the process adopted by "Mendeleev for the classification of elements". How did he arrive at the "Periodic Law"?
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 3
What is meant by periodicity in properties of elements with reference to the periodic table?
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 3
Why do all the elements of the same group have similar properties?
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 3
How will the tendency to gain electrons change as we go from left to right across a period? Why?