Chemistry
1. What do you understand by, the dual character of an electron?
An electron behaves as if it is a particle as well as a wave. This is known as the
dual nature of the electron.
2. In developing a wave equation, how does Schrodinger consider the electron?
Schrodinger considers the electron as a three dimensional wave in the electric
field of positively charged nucleus.
3. Define orbital?
The three dimensional space around the nucleus where the probability of finding
the electron is maximum is called as orbital.
4. State Heisenberg uncertainity principle.
In an orbital, it is not possible to find the exact position and momentum of the
electron at the same time.
5. What is an orbit?
Orbit is a definite circular path in which the electron revolves around the
nucleus.
6. Give examples for sub atomic particles other than electron, proton and neutron.
They are positron, neutrion, photon, graviton, antiproton are stable particles
whereas pi meson, zeta meson, tau meson kappa meson, chai meson are unstable
particles.
7. Name the scientists who discovered proton, electron and neutron.
Goldstein discovered proton (1H1).
J.J. Thomson discovered electron (–1e0).
Chadwick discovered neutron (0n1)
8. Proton, electron and neutron are represent by 1H1, – 1e0, 0n1. What do they
signify?
1
1H means that mass of a proton is 1 unit and it has one positive charge.
0
–1e means that the electron has negligible mass and has one negative charge
1
0n means that the neutron has mass 1 unit and has no charge.
, 9. Define Principal quantum number.
Quantum number which describes the energy of the energy level in which the
electron is revolving round the nucleus is called as principal quantum number.
10. What do the values n = 1, n = 2, n = 3, n = 4 signify?
The value n = 1 denotes that the electron is in the first shell (K shell)
The value n = 2 denotes that the electron is in the second shell (L shell)
The value n = 3 denotes that the electron is in the third shell (M shell)
The value n = 4 denotes that the electron is in the fourth shell (N shell)
11. Indicate the maximum number of electrons that be present in K, L, M, N orbital.
Principal Shell Maximum
quantum Designation number of
number ‘n’ electrons (2n2)
1 K 2
2 L 8
3 M 18
4 N 32
12. For sub shells, 3s, 3p, and 3d what are the values of the principal and azimuthal
quantum numbers?
Sub shell n l
3s 3 0
3p 3 1
3d 3 2
13. For 4s, 4p, 4d, 4f subshells, what are the values of n and l ?
Sub shell n l
4s 4 0
4p 4 1
4d 4 2
4f 4 3
1. What do you understand by, the dual character of an electron?
An electron behaves as if it is a particle as well as a wave. This is known as the
dual nature of the electron.
2. In developing a wave equation, how does Schrodinger consider the electron?
Schrodinger considers the electron as a three dimensional wave in the electric
field of positively charged nucleus.
3. Define orbital?
The three dimensional space around the nucleus where the probability of finding
the electron is maximum is called as orbital.
4. State Heisenberg uncertainity principle.
In an orbital, it is not possible to find the exact position and momentum of the
electron at the same time.
5. What is an orbit?
Orbit is a definite circular path in which the electron revolves around the
nucleus.
6. Give examples for sub atomic particles other than electron, proton and neutron.
They are positron, neutrion, photon, graviton, antiproton are stable particles
whereas pi meson, zeta meson, tau meson kappa meson, chai meson are unstable
particles.
7. Name the scientists who discovered proton, electron and neutron.
Goldstein discovered proton (1H1).
J.J. Thomson discovered electron (–1e0).
Chadwick discovered neutron (0n1)
8. Proton, electron and neutron are represent by 1H1, – 1e0, 0n1. What do they
signify?
1
1H means that mass of a proton is 1 unit and it has one positive charge.
0
–1e means that the electron has negligible mass and has one negative charge
1
0n means that the neutron has mass 1 unit and has no charge.
, 9. Define Principal quantum number.
Quantum number which describes the energy of the energy level in which the
electron is revolving round the nucleus is called as principal quantum number.
10. What do the values n = 1, n = 2, n = 3, n = 4 signify?
The value n = 1 denotes that the electron is in the first shell (K shell)
The value n = 2 denotes that the electron is in the second shell (L shell)
The value n = 3 denotes that the electron is in the third shell (M shell)
The value n = 4 denotes that the electron is in the fourth shell (N shell)
11. Indicate the maximum number of electrons that be present in K, L, M, N orbital.
Principal Shell Maximum
quantum Designation number of
number ‘n’ electrons (2n2)
1 K 2
2 L 8
3 M 18
4 N 32
12. For sub shells, 3s, 3p, and 3d what are the values of the principal and azimuthal
quantum numbers?
Sub shell n l
3s 3 0
3p 3 1
3d 3 2
13. For 4s, 4p, 4d, 4f subshells, what are the values of n and l ?
Sub shell n l
4s 4 0
4p 4 1
4d 4 2
4f 4 3
