Question

neon-22 contains ______ neutrons.
10
12
22
2

Explanation:

Step1: Recall the formula for neutrons

The number of neutrons (\(n\)) in an atom is given by the mass number (\(A\)) minus the atomic number (\(Z\)), i.e., \(n = A - Z\).

Step2: Determine \(A\) and \(Z\) for Neon

For Neon, the atomic number \(Z = 10\) (from the periodic table). The mass number \(A\) for Neon - 22 is 22 (since the notation is \(^{A}\text{X}\), here \(X\) is Ne and \(A = 22\)).

Step3: Calculate the number of neutrons

Substitute \(A = 22\) and \(Z = 10\) into the formula: \(n=22 - 10=12\).

Answer:

12 (The correct option is the one with 12, so if we consider the options as: 10, 12, 22, 2; the answer is the option with 12, e.g., if the options are labeled as: the option with 12 (let's assume the second option is 12, so the answer is the option corresponding to 12, like if the options are A. 10, B. 12, C. 22, D. 2, then the answer is B. 12))