MEDIUM
9th ICSE
IMPORTANT
Earn 100

Sulphur has an atomic number of 16 and a mass number of 32. State the number of protons and neutrons present in the nucleus of sulphur. Draw a simple diagram to show the arrangement of the electrons in an atom of sulphur.

Important Questions on Atomic Structure

MEDIUM
9th ICSE
IMPORTANT

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which of the above elements will:

(a) forms anion or negative ion.

(b) forms cation or positive ion.

(c) has 4 electrons in the outermost orbit.

HARD
9th ICSE
IMPORTANT
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.
MEDIUM
9th ICSE
IMPORTANT
What is the relation between the number of protons and the number of electrons in an atom?
EASY
9th ICSE
IMPORTANT
How do metals differ from non-metals in ion formation.
MEDIUM
9th ICSE
IMPORTANT
How do metals differ from non-metals in the chemical nature of their oxides.
EASY
9th ICSE
IMPORTANT

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

MEDIUM
9th ICSE
IMPORTANT
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.