Question

in the isotope sodium - 24, what does the number 24 represent? (1 point) mass # atomic # # of neutrons # of protons

Explanation:

In isotope notation, the number after the element name (e.g., Sodium - 24) represents the mass number. The mass number is the sum of protons and neutrons in an atom. The atomic number (number of protons) for sodium is 11 (a known constant for the element sodium from the periodic table). The number of neutrons would be mass number - atomic number ($24 - 11=13$). But the notation Sodium - 24 specifically uses the 24 as the mass number.

Answer:

Mass #