3) Identify the noble gas in the following list A) helium B) nitrogen C) oxygen D) gold E) chlorine 4) The atomic number of an atom is equal to the number of A) nuclei B) neutrons C) neutrons plus protons D) electrons plus protons E) protons 5) Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the elementis A) 30 B) 32 C) 34 D) 64 E) 94 6) How many proton are in an isotope of sodium with a mass number of 25% B) 14 C) IS D) 25 E) 32 Isotopes are stoms of the
