apch02_atstructure - The particle that defines the identity...

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South Pasadena • AP Chemistry Name ________________________________ Period ___ Date ___/___/___ 2 • Atoms and Elements ATOMIC STRUCTURE Parts of Atoms: Most people already know that the atom is made up of three main parts, the _______________ and ______________ in the nucleus and the ______________ somewhere outside of the nucleus . Let’s summarize: proton neutron electron symbol charge location mass size (see below) Let’s make this more visual using information from the Chart of Fundamental Particles. If the proton were 10 cm in diameter… the size of an orange, how big would everything be? object actual size model size model proton 10 -15 m 10 cm orange neutron 10 -15 m electron 10 -18 m atom 10 -10 m The atom is often represented as a miniature ___________ _____________. Draw it: The mass of the atom is due to the _____________________________ The size of the atom is due to the __________________ How Many Particles in Each Atom?
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Unformatted text preview: The particle that defines the identity of an atom is the _____________. (shown on the periodic table) Every hydrogen atom has ___ proton. Every magnesium atom has ___ protons. Any atom that has 23 protons is _________________. Any atom that has 92 protons is _________________. The mass of an atom is mostly from the ___________ and ____________. Find O on the periodic table. It’s mass is ______ amu. It has ___ protons. It must have ___ neutrons. Electrically neutral atoms (as opposed to ions) have one electron for every proton. Fill in this chart for these neutral atoms: Atom Mass protons neutrons electrons He Si Be H Rn Ar F Pb If the mass is not close to a whole number, it is because the atom has several _____________. These are atoms with the same number of ___________ but different numbers of _____________. Chlorine has two isotopes: Cl-35 ( ___ p+ & ___ n ° ) and Cl-37 ( ___ p+ & ___ n ° )....
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