Class X

Number of protons inside nucleus represents
  1. atomic mass
  2. atomic number
  3. atomic count
  4. radioactivity level
Nuclei with atomic number 1 to 82 are
  1. stable
  2. unstable
  3. moderately stable
  4. radioactive
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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