HARD
9th CBSE
IMPORTANT
Earn 100

Compare all the proposed models of an atom given in this chapter.

Important Questions on Structure of the Atom

HARD
9th CBSE
IMPORTANT
Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
HARD
9th CBSE
IMPORTANT
Define valency by taking examples of silicon and oxygen.
EASY
9th CBSE
IMPORTANT
Explain with examples: Atomic number
MEDIUM
9th CBSE
IMPORTANT
Explain with examples: Mass number
MEDIUM
9th CBSE
IMPORTANT
Explain with examples: Isotopes. Give any two uses of isotopes.
MEDIUM
9th CBSE
IMPORTANT
Explain with examples: Isobars.
MEDIUM
9th CBSE
IMPORTANT
Na+ has completely filled K and L shells. Explain.
HARD
9th CBSE
IMPORTANT
If bromine atom is in the form of say two isotopes 3579Br 49.7% and 3581Br (50.3%), then calculate the average mass of bromine atom.