MEDIUM
10th CBSE
IMPORTANT
Earn 100

Give an account of the process adopted by "Mendeleev for the classification of elements". How did he arrive at the "Periodic Law"?

Important Questions on Periodic Classification Of Elements

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?
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 4
Mendeleev "predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium".
(a) Name the elements that have taken the place of these elements
(b) Mention the group and the period of these elements in the Modern periodic table.
(c) Classify these elements as metals, non-metals or metalloids
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 1
What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations that posed challenge to Mendeleev's periodic law.
(a) Why do we classify elements?
(b) What were the two criteria used by Mendeleev in creating his period table.
(c) Why did Mendeleev have some gaps in his periodic table?
(d) In the Mendeleev's periodic table, why was there no mention of noble gases like helium, neon and argon?
(e) Would you place the two isotopes of chlorine Cl-35 and Cl-37 in different slots, because of the difference in their atomic masses or in the same slot because their chemical properties are same. Justify your answer.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 2
State Mendeleev's periodic law.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 2
Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 2
Why did Mendeleev have gaps in his periodic table?