HARD
9th CBSE
IMPORTANT
Earn 100

Show diagrammatically the electron distribution in a sodium atom and a sodium ion and also give their atomic number.

Important Questions on Structure of Atom

HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 1
An atom of an elements is represented as  X1123.
(i) What is the number of proton in X?
(ii) What is the number of neutrons X?
(iii) How are the electrons distributed around the nucleus of X?
HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 2

What do you understand by the term electronic configuration? State Bohr-Bury's scheme of electronic configuration.

EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 3
State three ways in which a proton differs from an electron.
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 4
State Bohr's model of the structure of atom.
HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 5
In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom. ~1.00% of the α-particles were found to deflect at angles> 50°, If one mole of α-particles were bombarded on the gold foil, calculate the number of α-particles that would deflect at angles less than 50°. 
HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 6

Complete the table given below on the basis of information available in the symbols given below.
(A) Cl1735
(B)  C612
(C)  Br3581

Element np nn
     


        

HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 7
Enlist the conclusions drawn by Rutherford from his α-ray scattering experiment.
HARD
9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4A>Q 8
In what way was the Rutherford's atomic model different from that of Thomson's atomic model?