EASY
10th CBSE
IMPORTANT
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Every period of the periodic table starts with a member of alkali metal group.

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Important Questions on Periodic Classification of Elements

HARD
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 22
The d-block elements have fixed valency.
HARD
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 23
In the lanthanoid series the electrons occupy 4f- orbitals in preference of 5d- and 6p- orbitals.
MEDIUM
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 24
Seventh period of periodic table is incomplete.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 25
First period contains only 2 elements.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 26
Most of the elements are metals.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 27
Group 1 elements are called alkali metals.
MEDIUM
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 28
Group 16 elements are called chalcogens.
EASY
10th CBSE
IMPORTANT
Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 7>Q 29
Atomic number can never be fractional.