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Uttarakhand Board Class 10 Classification of Elements — practice questions

Explore 12 free Classification of Elements questions in Uttarakhand Board Class 10 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Elements questions and exercises with answers

Showing questions 1–12 of 12.

Mendeleev arranged elements primarily in order of: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 →Sodium (atomic number 11) belongs to which group and period?Read the answer and worked solution →Which trend is followed by ionisation energy across a period?Read the answer and worked solution →Which of the following elements would lose an electron easily?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 →What type of oxide would Eka-aluminium form?Read the answer and worked solution →Three elements B, Si and Ge areRead the answer and worked solution →Which of the following elements will form an acidic oxide?Read 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 →

Worked practice questions

Mendeleev arranged elements primarily in order of:

  1. Atomic mass
  2. Atomic number
  3. Atomic radius
  4. Density
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Correct answer: A. Atomic mass

1. Mendeleev's periodic table predates the modern one. 2. He used the increasing atomic masses of the elements he knew. 3. He left gaps for undiscovered elements (eka-aluminium, eka-silicon, etc.). 4. Atomic number became the basis only after Moseley. 5. So the original Mendeleev arrangement used atomic mass. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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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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Sodium (atomic number 11) belongs to which group and period?

  1. Group 11, period 4
  2. Group 2, period 3
  3. Group 1, period 2
  4. Group 1, period 3
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Correct answer: D. Group 1, period 3

1. Sodium has electronic configuration 2, 8, 1. 2. Three electron shells place it in period 3. 3. One valence electron places it in Group 1. 4. So sodium is in Group 1, period 3. 5. Sodium is the second alkali metal after lithium. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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