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1. How many protons does an atom have if it has an atomic number of 12? a. 12 b. 6 c. 3 d. 10
2. Hydrogen is the simplest and the lightest element. It has an atomic number of 1. How many protons does Hydrogen atom have? a. 1 b. 2 c. 3 d. 4
3. Helium is an inert gas that is found in large amounts in the core of the stars as a product of thermonuclear fusion. It has an atomic mass of 4 and atomic number of 2. How many neutrons does a Helium atom have? a. 1 b. 2 c. 3 d. 4
4. Isotopes are atoms of the same element with the same number of protons and ___________. a. A different number of electrons. b. A different number of molecules. c. A different number of neutrons. d. The same number of neutrons.
5. In a neutral atom, the number of protons _____________ the number of electrons. a. Equals b. is less than c. is greater than
6. An atoms becomes negatively charged by _______. a. Gaining an electron b. Losing an electron c. Losing a proton d. Gaining a neutron
7. A(n) ______________ is a positively charged particle in the nucleus of an atom. a. Proton b. electron c. neutron d. positron
8. An atom or group of atoms that has a net negative charge is called a(n) _________. a. Ion b. cation c. anion d. compound
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