1-10-1. Which of the following subatomic particles are found in the nucleus of an atom?
A. protons and neutrons, B. protons and electrons,
C. neutrons and electrons, D. protons, neutrons, and electrons
1-10-2. Which of the following has the largest total mass?
A. 2 protons + 4 electrons, B. 2 neutrons + 2 protons,
C. 6 electrons, D. they all have the same mass
1-10-3. Which of the following is false?
A. An atom's mass is concentrated in the nucleus
B. The atom's nucleus is positively charged
C. The number of electrons in an atom is equal to the number of protons
D. The number of protons in an atom is equal to the number of neutrons
