Chemistry Class 11

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Questions and Answers

Which element of group 1 is known for its reactivity with water?

  • Rubidium
  • Lithium
  • Sodium
  • Potassium (correct)

What is the atomic number of the element found in the 3rd period and group 2 of the periodic table?

  • 20 (correct)
  • 12
  • 3
  • 4

Which subatomic particle is responsible for the identity of an element?

  • Neutron
  • Electron
  • Proton (correct)
  • Isotope

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Study Notes

Periodic Table and Elements

  • Alkali metals in Group 1 are known for their high reactivity with water, with the most reactive being Caesium.
  • The element in the 3rd period and group 2 of the periodic table is Magnesium, which has an atomic number of 12.
  • The atomic number of an element is determined by the number of protons in the nucleus, which is responsible for the identity of an element.

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