Class X

Nuclei with atomic number 1 to 82 are
  1. stable
  2. unstable
  3. moderately stable
  4. radioactive
Number of protons inside nucleus represents
  1. atomic mass
  2. atomic number
  3. atomic count
  4. radioactivity level
Radiations emitted by different elements are
  1. alpha
  2. beta
  3. gamma
  4. all of above
. Rate of radioactive decay is proportional to
  1. nature of rays
  2. no. of electron
  3. no. of protons
  4. no. of unstable nuclei
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