The number of protons within the atom's nucleus is called atomic number and is equal to the number of electrons in any neutral atom. each atomic number identifies a specific element, but not the a) cation. b) ion. c) isotope. d) molecule,

the answer is actually isotope (took the usa test prep test)

Explanation:

Isotope- Each atomic number identifies a specific element and the number of protons and electrons. The atomic number does no identify the isotope, which may have a variety of neutrons: c-12 and C-1 are examples.

(this is the explanation they gave)

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete