Question

In the symbol He, the superscript 4 is the ____________________ for helium.


Select one:


a. mass number

b. atomic mass Incorrect

c. atomic number

d. isotope number

Answer 1

the He nucleus has two protons and two neutrons, so 4 is the total number of nucleons, or the so-called the mass number, so choice A is correct.

Answer 2

btw, the atomic number is the number of protons, so it's 2. it's written as the left-subscript not as the superscript.

Answer 3

i don't see a definition of "isotope number" in my book, so i have no idea what it means, or maybe it's not an actual term.

Answer 4

gsoda is it atomic number

Answer 5

the atomic mass is the mass of an individual atom of some isotope of an element.

Answer 6

4 is the total number of nucleons, it's the mass number, so choice A is correct.

Answer 7

it's the mass number.

Answer 8

it was right gsoda you smart!!!!!!!!!!