Rutherford's Model of an Atom

Q. What is the mass (atomic mass unit) of proton?

1. 0.00054 a.m.u
2. 0.00154 a.m.u
3. 1.00778 a.m.u.
4. 2.00778 a.m.u.

Q.

Describe Rutherfords model of an atom.

Q.

What are the Defects of Rutherfords model of atom?

Q. The atomic number of sodium is 11. What is the electrical charge of its atom?

1. 0

2. +1

3. -2

4. -1

Q.

Rutherfords gold foil experiment showed that most of the $\mathrm{\alpha }$-particles passed through the gold foil without any deflection. It indicates that:

1. The nucleus is concentrated at the centre

2. The nucleus carries positive charge

3. There is lot of empty space in atom

4. The nucleus carries the most of the mass

Q.

What type of charge is present on the nucleus of an atom?

Q. Which atomic models could not explain the stability of an atom?

1. Dalton
2. Thompson
3. Rutherford
4. Bohr

Q.

Explain how Bohrs atomic model was contradictory to Heinsbergs uncertainty principle.

Q.

Rutherford’s α–particle scattering experiment showed that

(i) electrons have a negative charge

(ii) the mass and positive charge of the atom are concentrated in the nucleus

(iii) neutron exists in the nucleus

(iv) most of the space in an atom is empty. Which of the above statements are correct?

1. (i) and (iii)

2. (ii) and (iv)

3. (i) and (iv)

4. (iii) and (iv)

Q. How was atom discovered?
who discovered atom?
when was atom discovered?

Q.

What did Heisenberg and Schrodinger discover about the atom?

Q.

Why did Rutherford select a gold foil in his $\alpha$-particle scattering experiment?

Q.

Rutherford’s model was similar to the solar system.

1. True

2. False

Q. Which amongst the following does not have neutrons in their atom?

1. Protium

2. Deuterium

3. Tritium

4. Helium

Q.

"In Rutherford's modle if the atom the electrons revolve around the nucleus and the attractive force of the positively charged nucleus would be balanced by the centrifugal force arising due to the rotation of electrons"

Please explain me the meaning

Q.

Select the correct statement(s) regarding the electrical charge of electrons and protons.

1. Electrons are positively charged.

2. Electrons are negatively charged.

3. Protons are positively charged.

4. Protons are negatively charged.

Q.

Why is the charge on nucleus positive?

Q.

(a) Give the observations as well as inferences of Rutherfords scattering experiment for deter­mining the structure of an atom.

(b) On the basis of above experiment write the main features of atomic model.

Q.

In rutherford's experiment, when alpha particles were sent through a thin metal foil, only one out of ten thousand rebounded. This observation led to the conclusion that:

1. Unit positive charge is only present in an atom

2. Positively charged particles are concentrated at the centre of the atom

3. No positive charge is present.

4. More number of electrons are revolving around the nucleus of the atom

Q.

(a) What are the two main features of Rutherford's atomic model ?

(b) State its one drawback.

Q.

What did Schrodinger and Heisenberg discover about the atom?

Q.

What were the conclusions made by Rutherford regarding the atomic mass?

1. Mass of the atom is uniformly distributed

2. Nucleus of an atom is much lighter than electron

3. All the mass of an atom resides at the centre

4. Nucleus of an atom is much heavier than the electron

Q. How can we prove that the electrons carry negative charge?

Q. Rutherford discovered that the center of an atom is charged.

1. positive
2. negative
3. neutral

Q.

If an atom has 2 electrons in its outermost shell. Which of the following options can be the atomic number of that atom?

1. 10

2. 11

3. 12

4. 13

Q.

The nucleus of an atom is nearly___________________ in size in comparison to the total size of the atom.

Q. Which of the following sentence is wrong about Rutherford Model?

1. The size of nucleus is very big as compared to the size of the atom as a whole.
2. Electrons revolve in circular orbits in space available around the nucleus.
3. An atom is electrically neutral.
4. The nucleus is centrally located positively charged mass.

Q.

Diagram- based questions.

Look at the diagram given below and answer the following questions.

(a) Name the particles used by Rutherford, for this experiment.

(b) What is the nature of charge on these particles, positive or negative?

(c)Why did very few of these particles bounce back?

Q.

State Rutherfords structure of atom.

Q.

Which of the following scientists observed that cathode rays consist of negatively -charged particles?

1. John Dalton

2. J.J.Thomson

3. E.Goldstein

4. James Chadwick