HARD
9th ICSE
IMPORTANT
Earn 100

According to Dalton’s Atomic Theory, atoms of the same element are identical in all aspects. But according to the Modern Atomic theory, this postulate is proved wrong. Explain.

Important Questions on Atomic Structure

MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 13
What is the relation between the number of protons and the number of electrons in an atom?
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 14
How do metals differ from non-metals in ion formation.
MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 14
How do metals differ from non-metals in the chemical nature of their oxides.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 14

How do metals differ from non-metals in the electronic configuration of atom.

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 15
What are isotopes?
MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 15
Write down:
(i) the mass number of the atom having 20 neutrons and 15 protons
(ii) the number of neutrons in the molecules of an atom having atomic number 12 and mass number 37.
MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 16
An atom of fluorine may be written as F919. Write down the number of protons, neutrons and valence electrons around present in it.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 4 - Atomic Structure>Questions>Q 17

Chlorine is an element of atomic number 17. It is a mixture of isotopes having mass numbers of 35 and 37.

What is meant by the term atomic number?