Structure of The Atom

Structure of the atom Worksheet-4

11. Which of the following elements contains only two electrons in the outermost shell?

A. Helium                                       B. Beryllium

C. Magnesium                               D. All the above

12. Mass of neutron is :

A. equal to that of electron

B. equal to that of proton

C. less than that of proton

Structure of the atom Worksheet-5

1. There are 15 protons and 16 neutrons in the nucleus of an element. Calculate its atomic number and mass number. How will you represent the element?

2. The symbol of oxygen atom is ₈O¹⁶

(i) What is the name given to the number of protons in the nucleus of the atom?

(ii) What is the name given to the number of protons plus number of neutrons in the nucleus of the atom?

3. The atom of an element has 9 protons, 9 electrons and 10 neutrons.

(i) What is the atomic number of the element?

(ii) What is the mass number of the element?

Structure of the atom Worksheet-6

1. What are canal rays?

2. If an atom contains one electron and one proton, will it carry any charge or not?

3. On the basis of Thomsons model of an atom explain how the atom is neutral as a whole.

4. On the basis of Rutherford's model of an atom, which sub-atomic particle is present in the nucleus of an atom?

5. Draw a sketch of Bohr's model of an atom with three shells.

6. What do you think would be the observation if the α-particle scattering experiment is carried out using a foil of a metal other than gold?