- Specific gravity is unitlese because it is the density of one substance divided by the density of D) Specific gravity is a measure of the reactivity indes of a mubatance 66. 'The amallest amount of an element that retains that element's charackeristics is the A) atom. B) eloctron, c) molecule. D) neutron. B) proton 67. Which characteristics correctly describe a proton? A) approximate mass 1 amu; charge +1; inside nucleus B) approximate mass 5101 amu; charge - 1; outside nucleus C) approximate mass 5101 amu; charge +1; inside nucleus D) approximate mass 1 amu; charge 0 ; inside nucleus 8) approximate mass 1 amu; charge +1; outside nucleus 68. Protons possess a A) negative, nsgative charge, and electrons possess a B) negative, positive C) positive, negative D) positive, zero ) zero, positive 69. In a neutrai atom the number of A) protons, electrons is equal to the number of B) protons, neutrons C) neutrons, electrons D) protons + electrons, neutrons (i)) none of the above 70. An atom with 26 and A58 contains protons and charge. A) 26;58 B) 58;26 C) 26;32 D) 32;26 (e) 26;81 12. For the isotope 71Ga,2 and A - A) 31;10 B) 71;31 (C) 71;10 D) 31;71 B) 31;69.723 n. The symbol of the element with 23 protons is A) Mg. B) Na. C) V