Bohr's Model of an Atom

Q.

How to determine whether an electric charge is positive or negative ?

Q.

The maximum number of electrons that can be accommodated in an orbit is given by the formula ___ where "n" is the number of orbit.

Q.

What are the elementary particles?

Q.

Which of the following statements does not form a part of Bohrs model of a hydrogen atom?

1. Energy of the electrons in orbit is quantised

2. Electrons revolve in different orbits around the nucleus

3. The electron in orbit nearest to the nucleus has the lowest energy

4. The electrons position and velocity in orbit cannot be determined simultaneously.

Q.

The principal quantum number describe?

1. Shape of orbital

2. Size of the orbital

3. Spin of an electron

4. Orientation in the orbital electron cloud

Q. If opposite charges attract each other, then why does an electron revolve around the nucleus of an atom rather than just falling into the nucleus? In other words, why do electrons revolve around a nucleus and are not attracted to it?

Q.

How many quantum numbers are required for to identify the orbital?

Q.

The ……………… is a positively charged subatomic particle.

Q.

Two protons $P_1$and $P_2$ and electron e lie on a straight line as shown in figure. The direction of the net electric force on $P_1$, $P_2$ and $e$are shown. Mark the correct option.

1. 

2. 

3. 

4. 

5. 

Q.

What is Anti-Particle of Proton?

Q.

Write the charges on sub atomic particles.

Q. Why doesn't an electron just fall into the nucleus of an atom?

Q.

How many subatomic particles are there in an atom ?

1. two

2. three

3. four

Q.

The fundamental particle not present in a hydrogen atom is _____.

Q. Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point. This whole system is taken into an orbiting artificial satellite, then find the tension in the strings

Q. What are the differences between electrovalency , covalency and valency?

Q.

According to the Bohr's theory,

1. when a required amount of energy is supplied to an electron in an atom it jumps from lower orbit to higher orbit.

2. when a required amount of energy is supplied to an electron in an atom it jumps from a higher orbit to lower orbit.

3. the electrons stay in the same orbit.

4. when a required amount of energy is supplied to an electron in an atom it jumps randomly.

Q.

Name the subatomic particles.

Q.

The constituents of the nucleus are held together by?

1. Electromagnetic force

2. Strong force

3. Weak force

4. Gravitational force

Q.

Name a gas which produces positive rays which only consists of protons.

Q.

Like charges repel. what about protons in a nucleus which have positive charge but they don't repel

Q.

According to Bohrs atomic model,

1. Electrons revolve around the nucleus and continuously emit energy.

2. The energy of an electron does not alter with the change of the orbit.

3. Electrons revolve around the nucleus in spiral paths called stationary orbits.

4. A fixed amount of energy is emitted when an electron jumps from an outer orbit to an inner orbit.

Q.

Bohr's Model of the atom included the 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. All of these.

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

Q.

How two protons may attract each other

Q.

Can light be converted into mass?

Q. What are the three subatomic particles?

Q.

A neutral atom 'X' has a mass number 12 and atomic number 6. Calculate the number of electrons present in the atom.

1. 9

2. 6

3. 7

4. 5

Q. Assertion :Total energy of an electron in an hydrogen atom is negative. Reason: It is bounded to the nucleus.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q.

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

1. True

2. False

Q. Pairing of opposite spin is preferred for electrons, occuping the same orbital.

1. True
2. False