Quiz for Atomic Structure-

Q1: Who proposed the planetary model of the atom?

A. Thomson B. Bohr C. Rutherford D. Dalton

Q2: What is the maximum number of electrons in the n=3 shell?

A. 8 B. 18 C. 32 D. 2

Q3: Which quantum number determines the shape of an orbital?

A. Principal B. Azimuthal C. Magnetic D. Spin

Q4: Which orbital has spherical shape?

A. p B. d C. f D. s

Q5: The total number of orbitals in the third shell is:

A. 4 B. 9 C. 16 D. 18

Q6: Which of the following represents the correct set of quantum numbers for 3p electron?

A. n=3, l=0 B. n=2, l=1 C. n=3, l=1 D. n=3, l=2

Q7: Which rule explains the filling of orbitals in increasing order of energy?

A. Pauli Exclusion B. Aufbau Principle C. Hund’s Rule D. Bohr’s Rule

Q8: What is the maximum number of electrons in a p-subshell?

A. 2 B. 4 C. 6 D. 10

Q9: Who discovered the electron?

A. Rutherford B. Bohr C. Thomson D. Chadwick

Q10: Which of these orbitals is not possible?

A. 1s B. 2p C. 3d D. 2d

Q11: Which of the following is the correct electronic configuration for oxygen (Z=8)?

A. 1s² 2s² 2p⁶ B. 1s² 2s² 2p⁴ C. 1s² 2s⁴ 2p² D. 1s² 2s² 2p²

Q12: The energy difference between two shells gives rise to:

A. Spectral lines B. Mass number C. Atomic number D. Neutron emission

Q13: Which quantum number distinguishes orbitals of the same type in different orientations?

A. Principal B. Spin C. Magnetic D. Azimuthal

Q14: The spin quantum number values are:

A. +½ and −½ B. 0 and 1 C. Only 1 D. +1 and −1

Q15: What is the angular momentum of an electron in s-orbital?

A. Zero B. One C. Two D. Three

Q16: Which model explained the stability of atom using fixed energy levels?

A. Bohr’s Model B. Thomson’s Model C. Rutherford’s Model D. Quantum Mechanical Model

Q17: Which of the following violates Pauli’s exclusion principle?

A. Two electrons in same orbital with same spin B. Opposite spins C. Different orbitals D. Different energies

Q18: Who discovered the neutron?

A. Rutherford B. Bohr C. Chadwick D. Goldstein

Q19: Which of the following quantum numbers defines the size of the orbital?

A. n B. l C. m D. s

Q20: Which of the following elements has a completely filled s and p subshell in its outermost energy level?

A. Na B. Mg C. Ne D. Ar