JSS 3: ISOTOPE

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Isotope can be defined as atoms of the same element with the same atomic number but different mass number.

Isotope could also be defined as atoms of the same element with the same number of protons but different number of electrons.
                               Isotopy
Isotopy is a phenomenon whereby atoms of the same element have the same atomic number but different mass number.

Examples of elements that exhibit isotopy:
   
Class activities 
1. An isotope is defined as atoms of the same element that have the same (a) mass number (b) atomic number (c) number of neutrons (d) number of shells.

2. Isotopes of an element differ in their (a) number of protons (b) number of electrons (c) number of neutrons (d) atomic number.

3. Which of the following is a pair of isotopes? (a) ¹²₆C and ¹⁴₆C (b) ¹²₆C and ¹⁴₇N (c) ²³₁₁Na and ²⁴₁₂Mg (d) ¹⁶₈O and ¹⁴₇N

4. The chemical properties of isotopes are almost the same because they have the same (a) mass number (b) atomic number (c) number of neutrons (d) molecular mass.

5. Which of the following is an isotope of hydrogen? (a) Carbon (b) Deuterium (c) Helium (d) Oxygen.

6. The three common isotopes of hydrogen are protium, deuterium and (a) tritium (b) radium (c) uranium (d) helium.

7. The atomic number of all isotopes of an element is (a) different (b) constant (c) increasing (d) decreasing.

8. Which of the following is a radioactive isotope? (a) Carbon-12 (b) Carbon-13 (c) Carbon-14 (d) Oxygen-16.

9. Isotopes are useful in medicine mainly for (a) making plastics (b) treating and diagnosing diseases (c) producing glass (d) making fertilizers.

10. The mass numbers of isotopes are different because they contain different numbers of (a) protons (b) electrons (c) neutrons (d) nuclei.

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