When does # of neutrons = 0?

[FROGGBUSTER]

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Which of the following statements must be true concerning any real element?

A. A > Z
B. Z > A
C. If the element is an ion, the value of Z is negative.
D. The value of Z cannot be larger than the value of A

The answer is D, but I chose A because that was the first thing I saw lol.

I'm guessing this implies that A=Z in some cases, which means the # neutrons = 0 in some elements? Is this right?

 

[Ferocity]

Z = protons
A = atomic mass

The correct answer is simply stating that you cannot have more protons than the atomic mass.

A=Z for hydrogen. It has 0 neutrons.

 

[FROGGBUSTER]

Yeah I probably would have chosen that on a test if I had read all the choices.

But if A>Z is not always true, this implies that A can = Z in some cases, which implies neutrons can = 0. I've never heard of a neutron-less atom though.

Thoughts?

 

[FROGGBUSTER]

nice edit, thanks. forgot about Hydrogen.