Question 12 of 42beginner🔧 ApplyNumerical2 marks

An atom 23A has 11 electrons. Find the number of neutrons in it.

Correct Answer

12

Exercise: Pause and Ponder | Q: 13 | (Chapter: 11)
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Explanation

The mass number of the atom is given as 23 from the notation. In a neutral atom, the number of protons equals the number of electrons, which is 11. Using the formula Mass number = Number of protons + Number of neutrons, we find the Number of neutrons = 23 - 11 = 12.

Solution Steps

  1. Step 1: Identify the mass number from the notation 23^{23}A, which is 23.

  2. Step 2: Determine the number of protons. Since the atom is neutral, the number of protons equals the number of electrons. Given electrons = 11, protons = 11.

  3. Step 3: Use the formula: Mass number = Number of protons + Number of neutrons.

  4. Step 4: Calculate Number of neutrons = Mass number - Number of protons = 23 - 11 = 12.

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