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Published byDaniella Ferguson Modified over 9 years ago
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The Periodic Table
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Define the following terms. 1. proton 2. neutron 3. electron 4. nucleus
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proton: ▪ a subatomic particle that is found in the nucleus of an atom ▪ it has a positive charge and a mass of 1 amu neutron: ▪ a subatomic particle that is found in the nucleus of an atom ▪ it has no charge and a mass of 1 amu
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electron: ▪ a subatomic particle that is found outside the nucleus in energy levels ▪ it’s constantly moving ▪ it has a negative charge and no mass nucleus: ► the center of an atom ► contains protons and neutrons ► contains the mass of the atom ► very, very small and dense
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Why is it appropriate to say that atoms are the “building blocks” of all matter?
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Many periodic tables look different but still contain similar information.
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1. atomic number - tells the # of protons (p + ) the atom has, by definition - also tells the # electrons (e - ), b/c atoms are neutral 2. chemical symbol - letter(s) that represent specific elements – only contain one capital letter 3. atomic mass - number of protons + the number of neutrons in one atom of the element (an average) - almost all mass is found in the nucleus of the atom
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