General
✓✗Thomson discovered
- Proton
- Atom
- Neutron
- Electron
General
✓✗Valency of a metal is equal to
- Number of valence electrons
- Number of electrons
- Number of shells
- Atomic number
General
✓✗Mass number is equal to
- Number of protons + electrons
- Number of protons + neutrons
- Number of electrons + neutrons
- Number of electrons + neutrons + Protons
General
✓✗An element has atomic number 13, its electronic configuration will be
- 2, 6, 5
- 2, 7, 4
- 2, 8, 3
- 2, 8
General
✓✗Absolute charge on an electron is
-
Coulombs
-
Coulombs
-
Coulombs
- None of these
General
✓✗Electronic configuration of elements represents
- Number of electrons in an atom
- Number of electrons protons and neutrons in an atom
- Arrangement of electrons in various shells of an atom
- None of these
General
✓✗According to Bohr, when electrons revolve in a particular orbit, they
- Gain energy
- Lose energy
- Either gain or lose energy
- Neither gain nor lose energy
General
✓✗Third energy level can hold maximum of
- 2 electrons
- 8 electrons
- 18 electrons
- 32 electrons
General
✓✗If an element combines by sharing of electrons. Then the valency is known as
- Elecrovalency
- Covalency
- Both ‘a’ and ‘b’
- None of these
General
✓✗What is the atomic number of an element which has 7 electrons in its M shell?
- 9
- 17
- 25
- 7