Question

5 multiple choice 10 points which distinguishes an atom of one element from an atom of a different element? the number of valance electrons the number of protons in the atomic number the number of neutrons in the atomic mass number 6 multiple choice 10 points which diagram best represents an atom of lithium (li)?

Explanation:

For question 5, the atomic number (number of protons) uniquely identifies an element. For question 6, lithium has 3 protons, 4 neutrons, and 3 electrons (2 in first shell, 1 in second).

Answer:

1. B. the number of protons in the atomic number
2. C. (with 3P, 4N, and electrons: 2 in inner shell, 1 in outer shell)