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Delhi Police SI Periodic Table — practice questions

Explore 4 free Periodic Table questions in Delhi Police SI Science. Open each question or exercise to read its content, reference answers and available explanation.

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Periodic Table questions and exercises with answers

Showing questions 1–4 of 4.

Which of the following are the elements of group 18?Read the answer and worked solution →In the modern periodic table, elements with atomic numbers 11 to 18 are placed in which period?Read the answer and worked solution →Which of the following inert (noble) gases is placed in period 4 of the periodic table?Read the answer and worked solution →In the modern periodic table, elements of which group have a complete outermost shell?Read the answer and worked solution →

Worked practice questions

Which of the following are the elements of group 18?

  1. Alkaline earth metals
  2. Halogens
  3. Alkali metals
  4. Noble gases
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Correct answer: D. Noble gases

1. Group 18 is the last column of the periodic table. 2. These elements have completely filled outer shells and are chemically inert. 3. They are known as the noble gases. _Source: RRB Group D CEN-02/2018 PYQ, Q.3._

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In the modern periodic table, elements with atomic numbers 11 to 18 are placed in which period?

  1. 3
  2. 1
  3. 2
  4. 4
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Correct answer: A. 3

1. Period 1 holds atomic numbers 1–2, period 2 holds 3–10. 2. The next period, period 3, holds atomic numbers 11–18. 3. Hence elements 11 to 18 are in period 3. _Source: RRB Group D CEN-02/2018 PYQ, Q.45._

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Which of the following inert (noble) gases is placed in period 4 of the periodic table?

  1. Rn
  2. Xe
  3. Ar
  4. Kr
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Correct answer: D. Kr

1. Noble gases occupy group 18; each period ends with one. 2. Period 3 ends with Ar, period 4 with Kr, period 5 with Xe, period 6 with Rn. 3. So the period-4 noble gas is Krypton (Kr). _Source: RRB Group D CEN-02/2018 PYQ, Q.50._

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