1) This element is extremely common, found in 75% of matter on Earth. It is the smallest, lightest element w/ only one proton and one electron. What is it? a) oxygen b) copper c) helium d) hydrogen e) radon f) gold 2) Helium, neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn) are known as the ___. a) Big 7 b) Noble Gases c) Reactive Gases d) Metals e) Group 12 f) Flammable Gases 3) In an atom, the electrons orbit (or spin) around the ____________. a) protons b) neutron c) shell d) nucleus e) They do not spin. f) other electrons 4) Which noble gas is the densest? (Dense meaning having the highest mass.) a) Oxygen b) Hydrogen c) Radon d) Helium e) Krypton f) Xenon

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