MEDIUM
10th CBSE
IMPORTANT
Earn 100

The first ionisation energy of an element is 736 kJ per mole of atoms. An atom of this element in the ground state has a total of how many valence electrons?

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Important Questions on Periodic Classification of Elements

MEDIUM
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 14
An atom of which of the following elements has the greatest ability to attract electrons?
EASY
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 15
At STP, which substance is the best conductor of electricity?
MEDIUM
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 16
Which metal is obtained commercially by the electrolysis of salt?
MEDIUM
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 17
Which element can be found in nature in the free (uncombined) state?
MEDIUM
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 18
Element M reacts with chlorine to form a compound with the formula MCl2. Element M is more reactive than magnesium and has a smaller radius than barium. This element is:
MEDIUM
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 19
The oxide of which element below can react with hydrochloric acid?
EASY
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 20
______is credited with developing the concept of atomic numbers.
EASY
10th CBSE
IMPORTANT
PRACHI SCIENCE CHEMISTRY CLASS-X>Chapter 5 - Periodic Classification of Elements>PRACTICAL SKILL BASED MCQs>Q 21
Elements in the modern version of the periodic table are arranged in order of increasing