Question 1
Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of

Sn?
◦ 118 protons, 118 neutrons, 50 electrons
◦ 118 protons, 50 neutrons, 118 electrons
◦ 68 protons, 68 neutrons, 50 electrons
◦ 50 protons, 50 neutrons, 50 electrons
◦ 50 protons, 68 neutrons, 50 electrons
Question 2
Isotopes are atoms of the same element that have ________.
◦ the same atomic number but different numbers of neutrons
◦ the same atomic mass but different numbers of protons
◦ the same atomic numbers but different numbers of protons
◦ the same atomic numbers but different numbers of electrons
◦ different atomic numbers