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Question

Calculate the mass number of Oxygen for all its isotopes.


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Solution

Definition

Isotopes:

  1. Isotopes are atoms of the same elements with identical atomic numbers but different mass numbers. For example Cl35 and Cl37.
  2. Isotopes has the same number of electron, proton but they have different number of neutron.
  3. All isotopes of an element have the same chemical properties
  4. All isotopes of an element has different physical properties

Isotopes of Oxygen

  1. Oxygen has 3 stable isotopes that are O16,O17,O18.
  2. The Atomic number of oxygen is 8.
  3. The Mass number of an atom is equal to the sum of the number of protons and neutrons.

Calculation for mass number

Part 1

O16

1. Number of protons in O16 = 8.

2. Number of neutrons in O16= 8.

3. MassnumberofO16=Numberofproton+Numberofneutrons

=8+8

= 16u

Part 2

O17

1. Number of protons in O17 = 8

2. Number of the neutron in O17= 9

3. Massnumber=Numberofproton+Numberofneutrons

=8+9

=17u

Part 3

O18

1. Number of protons in O18= 8

2. Number of neutrons in O18= 10

3. Massnumber=Numberofproton+Numberofneutrons

= =8+10

= 18u

Final Answer

  1. Mass number of O16= 16u
  2. Mass number of O17=17u
  3. Mass number of O18 = 18u


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