Question

question 2 (1 point)
an atom with an atomic number of 8 and a mass number of 15 contains
o a
8 protons, 8 electrons, 8 neutrons
o b
8 protons, 8 electrons, 9 neutrons
o c
8 protons, 8 electrons, 7 neutrons
o d
15 protons, 8 electrons, 8 neutrons

Explanation:

Step1: Recall the formula for mass number

Mass number \(A=\) number of protons \(p+\) number of neutrons \(n\).

Step2: Analyze each option

• Option a: \(p = 8\), \(n=8\), \(A=p + n=8 + 8=16

eq15\).

• Option b: \(p = 8\), \(n = 9\), \(A=p + n=8+9 = 17

eq15\).

• Option c: \(p = 8\), \(n = 7\), \(A=p + n=8 + 7=15\).
• Option d: \(p = 15\) (atomic number is given as 8, so number of protons should be 8), so this option is wrong.

Answer:

C. 8 protons, 8 electrons, 7 neutrons