EASY
10th CBSE
IMPORTANT
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Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

Important Questions on Periodic Classification Of Elements

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?
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5B>Q 2
State three limitations of Mendeleev's classification.
HARD
10th CBSE
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Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5C>Q 1
Which of the following statements is not correct about the trends when going from left to right across the long form of the period table?
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5C>Q 2
The element with atomic number 14 is hard and forms an acidic oxide and a covalent halide. To which of the following categories does the element belong?
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5C>Q 3

Which one of the following depict the correct representation of atomic radius(r) of an atom?

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EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5C>Q 4
Which one of the following does not increase while moving down the group of the periodic table?
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5C>Q 5
Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic masses.
(ii) Isotopes of an element have same atomic number.
(iii) Isotopes of an element show same physical properties.
(iv) Isotopes of an element show same chemical properties.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5C>Q 1
Write the formulae of chlorides of Eka-silicon and Eka- aluminium, the elements predicted by Mendeleev.