Question

question 10 of 10
sodium (na) has 11 protons and 12 neutrons. what is its isotope notation?
a. na - 11
b. na - 12
c. na - 23
d. na - 34

Explanation:

Step1: Calculate mass number

Mass number = number of protons + number of neutrons. Given protons = 11, neutrons = 12. So mass number \(=11 + 12=23\).

Step2: Determine isotope notation

Isotope notation is written as Element - mass number. For sodium (Na) with mass number 23, it is Na - 23.

Answer:

C. Na - 23