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Question
A nucleus of stable phosphorus has 15 protons and 16 neutrons.
- What is its atomic number and mass number?
- The nucleus of radio phosphorous has one neutron more than the stable nucleus. What will be its atomic number and mass number?
- What will be the atomic number and mass number of new nucleus formed by decay of a β-particle by the radio phosphorus in part (b)?
Solution
- Atomic number and mass number are as follows:
Atomic number = no. of protons = 15
Mass number = no. of protons + no. of neutrons = 15 + 16 = 31 - Atomic number = 15 and Mass number = 15 + 17 = 32
- Atomic number = 16 and Mass number = 32.
The number of protons increases by one and the number of neutrons decreases by one following the emission of the β-particle. Thus, while the atomic number (Z) rises by one, the mass number (A) remains same.
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