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Indian Navy 10+2 B.Tech Cadet The Periodic Table — practice questions

Explore 31 free The Periodic Table questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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The Periodic Table questions and exercises with answers

Showing questions 1–30 of 31.

Across a period from left to right, the atomic radius generally:Read the answer and worked solution →Which element has the highest first ionization energy in period 2?Read the answer and worked solution →What is the valency of an element with electronic configuration 2, 8, 3?Read the answer and worked solution →Which of the following elements does not lose an electron easily?Read the answer and worked solution →Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, AlRead the answer and worked solution →Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, FRead the answer and worked solution →On moving from left to right in a period in the periodic table, the size of the atom.Read the answer and worked solution →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why resonance is neededRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: what bond parameters affectRead the answer and worked solution →Bond parameters in useRead the answer and worked solution →Which parameter answers this?Read the answer and worked solution →True or false: resonanceRead the answer and worked solution →Order the steps: draw a Lewis structureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: structureRead the answer and worked solution →

Worked practice questions

Across a period from left to right, the atomic radius generally:

  1. Decreases
  2. Remains constant
  3. Increases
  4. First increases then decreases
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Correct answer: A. Decreases

Atomic radius **decreases** from left to right across a period. Why: nuclear charge ($Z$) increases by 1 as you move right, pulling electrons closer. The added electron enters the same shell so screening barely increases — the net effect is stronger attraction and smaller radius. Across period 2: Li (152 pm) → Be → B → C → N → O → F (72 pm). Roughly halves. Down a group, atomic radius *increases* (electrons go into higher principal shells, further from nucleus).

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Which element has the highest first ionization energy in period 2?

  1. Carbon (C)
  2. Oxygen (O)
  3. Neon (Ne)
  4. Lithium (Li)
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Correct answer: C. Neon (Ne)

First ionization energy generally increases across a period because nuclear charge grows and atomic radius shrinks, making it harder to remove an outer electron. In period 2: Li (520) < Be (899) ≈ B (801) < C (1086) < N (1402) > O (1314) < F (1681) < **Ne (2081)** kJ/mol. Neon has the highest because it has a stable octet ($1s^2 2s^2 2p^6$, full $2p$). Removing an electron requires breaking that closed shell. Note two anomalies: B < Be (removing a $2p$ electron easier than $2s$) and O < N (paired $2p$ electron in O has extra repulsion).

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What is the valency of an element with electronic configuration 2, 8, 3?

  1. Three
  2. Two
  3. Five
  4. Eight
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Correct answer: A. Three

1. The element has 3 electrons in the outermost shell. 2. Valency for groups 1-2 and 13 is the number of valence electrons. 3. With 3 valence electrons, the element gives a valency of 3. 4. So the valency is three. 5. The element is aluminium with atomic number 13. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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