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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements5 Marks
Question
Properties of the elements are given below. Where would you locate the following elements in the periodic table?
  1. A soft metal stored under kerosene.
  2. An element with variable (more than one) valency stored under water.
  3. An element which is tetravalent and forms the basis of organic chemistry.
  4. An element which is an inert gas with atomic number 2.
  5. An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “anodising”.
✓

Answer

  1. Sodium (Group 1 and Period 3) or Potassium (Group 1 and Period 4).
  2. Phosphorus (Group 15 and Period 3). It shows variable valencies 3 and 5 and is stored under water.
  3. Carbon (Group 14 and Period 2).
  4. Helium (Group 18 and Period 1).
  5. Aluminium (Group 13 and Period 3).

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