Structure of the Atom| Worksheet| Class 9

Worksheet for chapter: Structure of the Atom is presented below. The worksheets are provided for practice and self evaluation of students of class 9. Solutions are provided at the end of the page.

(1)Write electronic configuration of element X which has atomic number = 15.Write its valency also.

 

Structure of the atom, Q 2, practice sheet, NCERT, class 9

(3) Differentiate between atomic number and mass number.

 

(4) An element has mass number equal to 32. What do you understand by it?

 

(5)If number of electron in outermost shell of an atom is 6. What will be the charge of atom?

 

(6) Complete the table given below –

SN Atomic number Number of proton Number of neutron Mass number Distribution of electrons Valency
1. 18   2 20 2,8,8
2. 4 5
3. 14 5 2,8,4

 

Structure of the atom, Q 7, practice sheet, NCERT, class 9

(8) Differentiate between average atomic mass and mass number.

 

Structure of the atom, Q 9, practice sheet, NCERT, class 9

(10) Who proposed that electrons are embedded in positive sphere-

(i) J.J.Thomson        (ii) Rutherford’s Model        (iii) Bohr’s Model

 

Helping Topics

Structure of the Atom

NCERT Solutions Class 9

Atoms and Molecules

Worksheet Solutions Class 9

 

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