Question

What will be the number of neutrons in an atom having atomic number 35 and mass number 80?

• A. 35
• B. 45
• C. 55
• D. 80

Hint:

The atomic number represents the number of protons, and the mass number is the total number of protons and neutrons. Subtracting the atomic number from the mass number gives the number of neutrons.

Answer 1

The Correct Option is B

The number of neutrons in an atom can be calculated using the formula: \[ \text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number} \] Here, the atomic number is given as \( 35 \) and the mass number is given as \( 80 \). Substituting these values into the formula: \[ \text{Number of Neutrons} = 80 - 35 = 45 \] Thus, the correct answer is \( \boxed{45} \).