Questions
An atom is electrically neutral because the number of protons present in it is
- more than the number of electrons present in it
- more than the number of neutrons present in it
- equal to the number of electrons present in it
- equal to the number of neutrons present in it
Which of the following statements is correct about a neutron?
- It has mass of 1 u and relative charge of + 1.
- It has mass of 1 u and no charge.
- It has mass of 1 u and relative charge of – 1.
- It has negligible mass and relative charge of + 1.
Which of the following atoms has the least valency?
- Oxygen
- Magnesium
- Aluminium
- Chlorine
Which of the following sub-atomic particles has/have 1 u relative mass and + 1 relative charge?
(i) Proton
(ii) Electron
(iii) Neutron
- Both (i) and (iii)
- Only (i)
- Both (iii) and (ii)
- Only (iii)
If K-shell and L-shell of an atom are full and the other shells are unfilled, then what will be the atomic number of the atom?
- 2
- 8
- 10
- 20
If the atomic number and mass number of an element respectively are 11 and 23, then what will be the number of neutrons present in it?
- 11
- 12
- 23
- 26
What is the maximum number of electrons that can be accommodated in the outermost orbit of an oxygen atom?
- 8
- 6
- 12
- 32
Which of the following is not a postulate of Dalton’s atomic theory?
- Matter is made up of tiny particles called atoms.
- An atom comprises of smaller particles, which are neutrons, protons and electrons.
- Atoms can neither be created nor destroyed.
- Atoms of different elements have different masses and chemical properties.
Which of the following particles is/are not part of the atomic nucleus?
- Electrons
- Protons
- Neutrons
- Both (2) and (3)
What will be the mass number of an atom if the number of electrons, protons and neutrons is 8, 8 and 9, respectively?
- 16
- 20
- 18
- 17