1)If a Boron atom has 5 protons, 6 neutrons, and 5 electrons, it has a mass of ______.

A)11
B)10
C)6

2)The atomic number of an atom is the total number of ______ in the nucleus.

A)protons and electrons
B)protons
C)neutrons

3)A lithium atom has 3 protons, 3 neutrons, and 3 electrons. Which of the following sets of particles represents and ISOTOPE of this atom?

A)4 protons, 3 neutrons, and 4 electrons
B)3 protons, 4 neutrons, and 3 electrons
C)4 protons, 4 neutrons, and 4 electrons