Free & Premium Study Material · Online Courses · Instant Download+91 99398 78821 · support@downloadstore.in
downloadstoreSTUDY MATERIAL
LoginRegister🛒0

Atomic Structure

99 MCQ questions with answers and explanations · page 4 of 4

Test yourself▶ 25 question test▶ 50 question test

Q76. The number of core electrons in sodium atom is-

  1. A1
  2. B2
  3. C8
  4. D10
Show answer & explanation

Answer: D) 10

Q77. The electronic configuration of an atom is 2, 8, 2. The number of valence electrons in it is-

  1. A10
  2. B12
  3. C8
  4. D2
Show answer & explanation

Answer: D) 2

Q78. Which of the following particles has 20 neutrons and 18 electrons?

  1. A₁₇C1ᶾ⁷
  2. B₁₈Arᶾ⁸
  3. C₁₉Kᶾ⁹
  4. D₁₆Sᶾ⁶
Show answer & explanation

Answer: B) ₁₈Arᶾ⁸

Q79. The nature of elements can be known by-

  1. Aby electronic configuration
  2. Bby atomic number
  3. Cby atomic mass
  4. DBy atomic weight
Show answer & explanation

Answer: A) by electronic configuration

Q80. The electronic configuration of the atom with atomic number 20 is-

  1. A2, 8, 10
  2. B2, 6, 8, 4
  3. C2, 8, 8, 2
  4. D2, 10, 8
Show answer & explanation

Answer: C) 2, 8, 8, 2

Q81. Which one of the following is the correct electronic configuration of chlorine?

  1. A2, 7, 8
  2. B2, 8, 7
  3. C2, 8, 8
  4. D7, 8, 2
Show answer & explanation

Answer: B) 2, 8, 7

Q82. Which of the following electronic configurations is not possible?

  1. A1s²
  2. B1s², 2s²2p⁶2d¹⁰, 3s²
  3. C1s², 2s² 2pµ
  4. D1s², 2s²2p⁶, 3s¹
Show answer & explanation

Answer: B) 1s², 2s²2p⁶2d¹⁰, 3s²

Q83. 1s², 2s²2p⁶ is the electronic configuration of?

  1. ANa and Ne
  2. BNe and Na⁺
  3. CNe and F
  4. DNa⁺ and F
Show answer & explanation

Answer: B) Ne and Na⁺

Q84. Which of the following electronic configurations is for metallic elements?

  1. A2, 8
  2. B2, 8, 7
  3. C2, 8, 8
  4. D2, 8, 8, 2
Show answer & explanation

Answer: D) 2, 8, 8, 2

Q85. Which of the following electronic configurations occurs for metallic elements?

  1. A2,8
  2. B2, 8, 7
  3. C2, 8, 18
  4. D2, 8, 18, 2
Show answer & explanation

Answer: D) 2, 8, 18, 2

Q86. The electronic structure of ₁₃AI²⁷ is-

  1. A2, 8, 2, 1
  2. B2, 8, 3
  3. C2, 8, 1, 2
  4. D3, 8, 2
Show answer & explanation

Answer: B) 2, 8, 3

Q87. Which of the following electronic structures is that of sodium ion?

  1. A2, 8, 1
  2. B2, 8
  3. C2, 8, 8
  4. D2, 8, 7
Show answer & explanation

Answer: B) 2, 8

Q88. If the number of orbits is expressed by n, then the maximum number of electrons in any orbit will be-

  1. An
  2. Bn²
  3. C2n²
  4. D2nᶟ
Show answer & explanation

Answer: C) 2n²

Q89. How many electrons can be present in the outermost orbit of an atom?

  1. A2
  2. B8
  3. C18
  4. D16
Show answer & explanation

Answer: B) 8

Q90. If the third orbit of an atom is the outermost orbit, what is the maximum number of electrons it can hold?

  1. A8
  2. B16
  3. C18
  4. D36
Show answer & explanation

Answer: C) 18

Q91. The maximum number of electrons that an atom of an element can have in its second orbit is-

  1. A8
  2. B32
  3. C18
  4. D2
Show answer & explanation

Answer: A) 8

Q92. Which of the following is the maximum number of electrons that can be present in the M shell?

  1. A2
  2. B8
  3. C18
  4. D32
Show answer & explanation

Answer: C) 18

Q93. What is the maximum number of electrons in the N shell?

  1. A2
  2. B8
  3. C18
  4. D32
Show answer & explanation

Answer: D) 32

Q94. Atoms are electrically-

  1. Apositively
  2. Bnegatively
  3. Cbipositively
  4. Dindifferently
Show answer & explanation

Answer: D) indifferently

Q95. The correct relation between energy (E), momentum (p) and velocity (c) of a photon is-

  1. Ap=Ec²
  2. Bp=Ec
  3. Cp=c/E
  4. Dp=E/c
Show answer & explanation

Answer: D) p=E/c

Q96. Stable nuclei (with light A < 10) have-

  1. Ahave approximately equal numbers of neutrons and protons
  2. Bhave more neutrons than protons
  3. Cthere are no neutrons
  4. DThere are no protons
Show answer & explanation

Answer: A) have approximately equal numbers of neutrons and protons

Q97. The chemical nature of an element depends on-

  1. Aon impulse
  2. Bon the electron
  3. Con the valence electron
  4. DOn the proton
Show answer & explanation

Answer: C) on the valence electron

Q98. The effective radius of an atom is-

  1. A10¯⁶m
  2. B10¯¹⁰m
  3. C10¯¹⁴m
  4. D10¯¹⁵m
Show answer & explanation

Answer: B) 10¯¹⁰m

Q99. Which one of the following statements regarding the atomic weight of an element is most appropriate?

  1. AThe atomic mass of an element is the sum of the protons and neutrons present in the atom of that element.
  2. BThe atomic weight of an element can vary depending on its mass number.
  3. CThe atomic weight of an element is an integer
  4. DAll atoms of an element have the same atomic weight
Show answer & explanation

Answer: B) The atomic weight of an element can vary depending on its mass number.

1234
← Acids, Bases, and SaltsChemical Bonding →
💬