Bohr's Model of an Atom

Q.

Bohr's Model of the atom included idea(s) like:

1. Electrons in atoms, orbit the nucleus

2. The electrons can only revolve in certain orbits at certain distance from the nucleus

3. When electrons gain and lose energy they jump from one orbit to another

4. All of these.

Q.

Match the correct order of elements to corresponding to the atomic structure.

1. C, F, E, B, A, D

2. C, E, F, A, B, D

3. E, F, C, A, D, B

4. C, F, E, D, B, A

Q.

According to Bohr and Bury models, the electrons are not accommodated in a given shell, unless the inner shells are filled.

1. False

2. True

Q. The number of neutrons present in the element ${}_Z^A\text{X}$ is given by ________.

(a) $\text{A-Z}$
(b) $\text{Z}$
(c) $\text{Z + A}$
(d) $\text{Z - A}$

[1 Mark]

Q. According to Bohr's model of the atom, 'while revolving in discrete orbits the electrons radiate energy.'

1. False
2. True

Q.

Select the correct statement that is proposed by Neils Bohr regarding the model of an atom.

1. The electron can have only certain energies, including a lowest-level ground state

2. All of these

3. Electrons emit energy as light when they move to lower energy orbits

4. Electrons absorb energy by moving to higher energy orbits.

Q. Atoms have electrons, protons, and neutrons as the fundamental particles. The net electrical charge on an atom is:

1. Positive
2. Neutral
3. Cannot be predicted
4. Negative

Q. Identify the names of the scientists who have proposed the model of an atom correctly.

1. J.J. Thomson
2. Rutherford
3. John Dalton
4. Neil Bohr

Q.

Assertion: K, L, M, N orbits can accommodate maximum of 2, 8, 18, 32 electrons respectively.

Reason: The maximum number of electrons in particular orbit is given by $2n^2$, where $n$ is orbit or shell number.

1. Assertion is true, but reason is false.
2. Assertion is false, but reason is true.
3. Both assertion and reason are true.
4. Both assertion and reason are false.

Q. Niels Bohr put across three postulates which tell us about the structure of an atom.

1. False
2. True