Unit 1 Review

This first unit was all about elements on the periodic table. What they are made up of like protons, neutrons, and electrons; how they are arranged both on groups with similar properties and by electron shells; and what they make when they combine and bond in different ways. Every element is different and makes up everything in the universe from the least complex like Hydrogen to the most reactive elements.

3. a) lithium- Li, 3, group 1, 3 protons and electrons

    b) bromine- Br, 35, group 7, 35 protons and electrons

    c) zinc- Zn, 30, transition metals, 30 protons and electrons

    d) sulfur- S, 16, group 6, 16 protons and electrons

    e) barium- Ba, 56, group 2, 56 protons and electrons

    f) carbon- C, 6, group 4, 6 protons and electrons

5. An isotope is an atom of an element with the same number of protons but different numbers of neutrons giving it a different atomic mass. The most common isotope is the one with the closest mass to the average atomic mass of that element.

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