In the ∝ - scattering experiment, few ∝ - particles rebounded because

All positive charge and mass of the atom is concentrated in small volume.

Most of the space in the atom is occupied.

Positive charge of the atom occupies very little space.

The mass of the atom is concentrated in the centre.

Match the names of the Scientists given in Column A with their contributions towards the understanding of the atomic structure as given in Column B. Column A Column B (a)Ernest Rutherford (i) Indivisibility of atoms (b) JJ. Thomson (ii) Stationary orbits (c) Dalton (iii) Concept of nucleus (d) Niels Bohr (iv) Discovery of electrons (e) James Chadwick (v) Atomic number (f) E. Goldstein (vi) Neutron (g) Moseley (vii) Canal rays

(a) Ernest Rutherford's gold foil experiment lead to the discovery of nucleus. (b) J.J. Thomson's cathode ray tube experiment showed that all atoms contain negatively charged subatomic particles, called electrons. (c) According to Dalton's atomic theory, all matter consists of indivisible particles called atoms. (d) According to Bohr's atomic theory, electrons orbit the nucleus at fixed energy levels called stationary orbits. (e) In the year 1932 James Chadwick discovered the subatomic particle neutron which is a neutral particle. (f) E.Goldstein discovered canal rays or anode rays. They are also called as positive rays. (g) Mosley gave the modern periodic law which states that, the physical and chemical properties of the elements are a periodic function of their atomic number. Column A Column B (a) Ernest Rutherford (iii) Concept of nucleus (b) JJ. Thomson (iv) Discovery of electrons (c) Dalton (i) Indivisibility of atoms (d) Niels Bohr (ii) Stationary orbits (e) James Chadwick (vi) Neutron (f) E.Goldstein (vii) Canal rays (g) Moseley (v) Atomic number

MEDIUM

Earn 100

Define radioactive elements.

Important Questions on Applied Chemistry

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

What are the drawbacks of Rutherford's model of atom?

EASY

Science>Chemistry>Applied Chemistry>Radiochemistry

How did Rutherford conclude that nucleus of an atom is massive ?

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

What observations in scattering experiment led Rutherford to make the following conclusions:
(i) The most of the space in an atom is empty.
(ii) The whole mass of an atom is present in the centre of the atom.
(iii) Nucleus has positive charge.

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

Name the experiment which established the presence of atomic nucleus. What features of the nucleus were deduced from this experiment?

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

What were the drawbacks of Rutherford's model of an atom?

MEDIUM

Science>Chemistry>Applied Chemistry>Radiochemistry

Rutherford showed that _____ rays come out of unstable nuclei. (cathode/ alpha)

MEDIUM

Science>Chemistry>Applied Chemistry>Radiochemistry

In the

\propto -

scattering experiment, few

\propto -

particles rebounded because

EASY

Science>Chemistry>Applied Chemistry>Radiochemistry

Which of the following observations were obtained from

α

-particle scattering experiment?

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

Match the names of the Scientists given in Column A with their contributions towards the understanding of the atomic structure as given in Column B.

Column A	Column B
(a)Ernest Rutherford	(i) Indivisibility of atoms
(b) JJ. Thomson	(ii) Stationary orbits
(c) Dalton	(iii) Concept of nucleus
(d) Niels Bohr	(iv) Discovery of electrons
(e) James Chadwick	(v) Atomic number
(f) E. Goldstein	(vi) Neutron
(g) Moseley	(vii) Canal rays

MEDIUM

Science>Chemistry>Applied Chemistry>Radiochemistry

What are the limitations of Rutherford's model of the atom?

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

State the drawbacks of Rutherford's model of atom.

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

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

Science>Chemistry>Applied Chemistry>Radiochemistry

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?

MEDIUM

Science>Chemistry>Applied Chemistry>Radiochemistry

Describe the observations in

α

-particle scattering experiment which led Rutherford to make the following conclusions: Almost the entire mass of an atom is present in the nucleus of atom.

HARD

Science>Chemistry>Applied Chemistry>Radiochemistry

Explain:
(i) Nucleus of an atom carries positive charge.
(ii) Most of the space in an atom is empty.
(iii) The whole mass of an atom is present in the centre of the atom.

MEDIUM

Science>Chemistry>Applied Chemistry>Radiochemistry

The nucleus of an atom is massive and positively charged. How will you justify?

EASY

Science>Chemistry>Applied Chemistry>Radiochemistry

What do you think would be the observation if the