Question 13 of 42beginner🔧 ApplyNumerical2 marks

The nucleus of an atom contains 20 protons. If its mass number is 41, find the number of neutrons in it.

Correct Answer

21

Exercise: Pause and Ponder | Q: 11 | (Page 11)
For More Understanding

Explanation

The mass number of an atom is defined as the total number of protons and neutrons present in its nucleus. By rearranging this relationship, the number of neutrons can be found by subtracting the number of protons from the mass number.

Solution Steps

  1. Step 1: Identify the given values: Mass number = 41 and Number of protons = 20.

  2. Step 2: Apply the formula: Mass number = Number of protons + Number of neutrons.

  3. Step 3: Rearrange the formula to find the number of neutrons: Number of neutrons = Mass number - Number of protons.

  4. Step 4: Substitute the values and calculate: Number of neutrons = 41 - 20 = 21.

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