Neutron

Q. One atom of Helium has 2 electrons, 2 protons and 2 neutrons. Calculate the atomic number and mass number of Helium. ​

1. Atomic number = 2​

   Mass number = 4​

2. Atomic number = 4​

   Mass number = 6​

3. Atomic number = 4​

   Mass number = 2​

4. Atomic number = 2​

   Mass number = 6​

Q. Match the sub-atomic particles with the nature of charge on them.

1. Negative
2. Positive
3. Neutral

Q. What are atoms

Q. Which of the following sub-atomic particles are present in an atom?

1. nucleus
2. electrons
3. protons
4. neutrons

Q. What are nucleons?

1. the sum of protons and neutrons present in the nucleus.
2. the number of protons in the nucleus.
3. the number of neutrons in the nucleus.
4. the sum of protons, neutrons and electrons present in the nucleus.

Q. Seein an atom figure doesnt looks that it would have only three sub-atomic particles, or the known sub-atomic particles cannot be divided, if it is then how many sub-atomic particles are present with their names and if not why?

Q.

The nucleus of an atom contains

1. electrons

2. protons alone

3. neutrons alone

4. protons and neutrons

Q.

____ is the fundamental particle that is not present in the nucleus of a hydrogen atom.

1. Proton

2. Nucleon

3. Electron

4. Neutron

Q.

____ is the fundamental particle that is not present in the nucleus of a hydrogen atom.

1. Nucleon

2. Neutron

3. Proton

4. Electron

Q.

How can we say that an atom

in an elemant is positievely

charged or negatively