What does the atomic number of an element NOT tell you?
A) The number of protons in an atom
B) The number of electrons in an atom
C) The identity & name of an element
D) The number of neutrons in an element

Hey there!

The atomic number is the number of protons in the atom, so A is incorrect.

In a neutral atom, which we assume unless otherwise stated, the number of protons is equal to the number of electrons, so B is incorrect.

The number of protons is what determines the name and identity of an element, so C is incorrect.

The only thing it doesn't tell us is the number of neutrons, because one kind of atom can have different isotopes.

So your answer is D) The number of neutrons in an element.

Hope this helps!

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally