Class X

The lifetime of unstable nuclei is
  1. 50 years
  2. 100 years
  3. Limited
  4. Unlimited
Isotopes have same number of protons but different number of
  1. Shells
  2. Neutrons
  3. Electrons
  4. Positrons
Beta particles are stream of high energy
  1. Protons
  2. Photons
  3. Electrons
  4. Positrons
The number of protons in the nucleus is called
  1. Atomic number (Z)
  2. Neutron number (N)
  3. Electron number (E)
  4. Atomic mass number (A)
In the nuclide defined by &¹⁵&₇ X, the number of protons and neutrons respectively are
  1. 8 and 6
  2. 15 and 7
  3. 7 and 8
  4. 23 and 15
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