Free Atomic Structure MCQs with Answers
922 Atomic Structure MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
Last updated
922 questions · page 36 of 47
- A. 486
- B. 324
- C. 243
- D. 450
Explanation: The given sequence is 2, 6, 18, 54, 162, ?. To find the pattern, observe that each term is obtained by multiplying the previous term by…
Correct answer: 486- A. 230
- B. 233
- C. 234
- D. 235
Explanation: To solve the sequence 4, 7, 15, 29, 59, 117, ?, observe the pattern of operations applied to each term:4 × 2 - 1 = 77 × 2 + 1 = 1515 × 2 -…
Correct answer: 235- A. 4
- B. 8
- C. 12
- D. 17
Explanation: To find the total number of male members in the family, start by identifying each group: the man himself is 1 male, his four sons add 4…
Correct answer: 17- A. A. If statement I is the cause and statement II is its effect;
- B. B. If statement II is the cause and statement I is its effect;
- C. C. If both the statements I and II are independent causes;
- D. D. If both the statements I and II are effects of independent causes;
- E. E. If both the statements I and II are effects of some common cause;
Explanation: The correct answer is Option B: Statement II is the cause and statement I is its effect.
Correct answer: B. If statement II is the cause and statement I is its effect;- A. Isotopes
- B. Isobars
- C. Isotones
- D. Isomers
Explanation: Isotopes: Atoms of the same element with the same number of atomic numbers but a different mass number.Isotones: Species or atoms having…
Correct answer: Isobars706. The total types of fundamental nuclear sub-atomic particles are there in the nucleus of an atom?
- A. More than 100
- B. 2
- C. 3
- D. Equal to 100
Explanation: In the nucleus of an atom protons and neutrons are present.
Correct answer: 2- A. The existence of X-rays
- B. The existence of negative particles
- C. The mass to charge ratio of the electron
- D. The nuclear model of the atom
Explanation: Rutherford's gold foil experiment was a pivotal moment in atomic physics.
Correct answer: The nuclear model of the atom- A. Atoms are indivisible.
- B. Atoms are very small.
- C. Atoms of an element are identical.
- D. Atoms of one element always differ in mass from those of another element.
Explanation: The correct idea is that atoms are very small. This aligns with modern atomic theory, which recognizes atoms as the basic units of matter…
Correct answer: Atoms are very small.- A. Sr³⁸
- B. Tc43
- C. Ru¹⁰¹
- D. Pd⁴⁶
Explanation: Calculate the total number of electrons: 36 (from Kr) + 2 + 5 = 43 electrons.
Correct answer: Tc43- A. 3p
- B. 3d
- C. 3f
- D. 4s
Explanation: After the 3s sub-shell, the next sub-shell to fill would be the 3p sub-shell.
Correct answer: 3p- A. High-energy electron beam
- B. X-rays
- C. Alpha particles
- D. All of the above
Explanation: Molecular ions are formed by passing high-energy electron beams, X-rays, or alpha particles through gases.
Correct answer: All of the above- A. 1s2, 2s2, 2p2
- B. 1s2, 2s2, 2px1, 2py1
- C. 1s2, 2s2, 2px2
- D. 1s2, 2s1, 2px1, 2py1, 2pz1
Explanation: In the excited state of carbon, electrons absorb energy and are promoted to higher energy orbitals, which results in a different…
Correct answer: 1s2, 2s1, 2px1, 2py1, 2pz1- A. 23, [Ar] 3d⁶
- B. 24, [Ar] 4s² 3d⁴
- C. 24, [Ar] 4s¹ 3d⁵
- D. 25, [Ar] 4s² 3d⁴
Explanation: The stable ion of the element X is tri positive, meaning it has lost three electrons.
Correct answer: 24, [Ar] 4s¹ 3d⁵- A. [He]2s1
- B. [Ne] 3s1
- C. [Ne]3s2
- D. [He]2s2
Explanation: The correct electronic configuration for sodium-11 is [Ne] 3s1. Sodium has 11 electrons, and its configuration follows that of the noble…
Correct answer: [Ne] 3s1- A. 1s¹ 2s¹ 2p¹
- B. 2s¹ 2p²
- C. 3p³
- D. 4s² 4p¹
Explanation: The correct answer is 4s² 4p¹, which corresponds to gallium (Ga), a Group III element.
Correct answer: 4s² 4p¹- A. 1s2 2s2 2p6 3s2 3p6 3d10 4s2
- B. 1s2 2s2 2p6 3s2 3p6 3d10
- C. 1s2 2s2 2p6 3s2 3p6 3d9 4s2
- D. 1s2 2s2 2p6 3s2 3p5 3d10 4s2
Explanation: The electron configuration of neutral gallium (Ga) is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1.
Correct answer: 1s2 2s2 2p6 3s2 3p6 3d10- A. 6.62 x 10^-34Js
- B. 6.02 x 10^-34Js
- C. 6.62 x 10^-33Js
- D. 6.34 x 10^-34 Js
Explanation: The value of Planck's constant (h) is approximately 6.62607015 × 10-34 Joule-seconds (Js) or 4.135667696 × 10-15 electron volts-seconds…
Correct answer: 6.62 x 10^-34Js- A. n=2,1=0, m=0
- B. nm23, 0=1, =1
- C. n= 3, l=5 ,m=2
- D. n=4, t=, m=2
Explanation: option b is incorrect because the l value should be less than n but here l value is greater l=n-1
Correct answer: n= 3, l=5 ,m=2- A. 3
- B. 2
- C. 0
- D. 1
Explanation: The azimuthal quantum number, represented by the symbol l, defines the shape of the orbital.
Correct answer: 3- A. n = 2, l = 2, m = 0, s = +1/2
- B. n = 3, l = 1, m = 0, s = +1/2
- C. n = 4, l = 3, m = 4, s = -1/2
- D. n = 4, l = 2, m = 4, s = -1/2
Explanation: The correct answer is Option B: n = 3, l = 1, m = 0, s = +1/2. This set of quantum numbers is valid because:n (principal quantum number)…
Correct answer: n = 3, l = 1, m = 0, s = +1/2