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Explain: Determining the Subatomic Particles of Atoms 8.5 B - identify that protons determine an element's identity and valence electrons determine its chemical properties, including reactivity. Each __________________ of the periodic table is made of only __________ kind of Parts of an atom __________________. Atoms are composed of subatomic particles called __________________, __________________, and __________________. In a __________________ atom, the __________________ charges of the Neutral atoms __________________ are __________________ by the __________________ charges of the __________________. Neutrons are __________________ and __________________ affect the __________________ of an atom. Periodic table info Use the periodic table to determine the number of protons, electrons, and neutrons. 1. Identify the number of protons. The Atomic number __________________ represents the number of __________________. Ex.) The atomic number for Oxygen is 8. That means all __________________ of oxygen have __________ protons. Atomic Number = Number of Protons 2. Identify the number of __________________. In a neutral atom, the number of Number of electrons __________________ charges must be __________________ by an __________________of __________________ charges. Ex.) Fluorine has an __________________ of 9. That means there are __________ positively charged __________________. Since it is a neutral atom, it also has __________ negatively charged __________________. Atomic Number = Number of Protons = Number of Electrons A P E (all three are equal in a neutral atom!) 3. Identify the number of __________________. __________________ the __________________ to the nearest __________________. The __________________ represents the number of __________________ plus the number of __________________ in the nucleus. A.) Fluorine has an __________________ of 18.998. Round it to the Atomic mass nearest whole number which is __________. B.) To find the number of neutrons: Atomic Mass Number Number Neutrons - 9 = 10 M - A = N _______ Ape man Number of = 19 ___________ Remember Atomic - A ___________ _______ M = ___________ _______ = - P ___________ _______ = ___________ _______ - = A = E ___________ = _______ N Another way to determine the number of protons, neutrons, and electrons… Fluorine -- F practice Atomic Number 9 Atomic Mass Number 19 Number of Protons 9 - Atomic Number 9 Number of Electrons 9 Number of Neutrons 10 Another way to determine the number of protons, neutrons, and electrons… More practice Aluminum -- ___ Atomic Number ___ Atomic Mass Number ___ Number of Protons ___ - Atomic Number ___ Number of Electrons ___ Number of Neutrons ___ Now, it’s your turn. Sodium -- ___ Atomic Number ___ Atomic Mass Number ___ Number of Protons ___ - Atomic Number ___ Number of Electrons ___ Number of Neutrons ___ Atomic Number ___ Atomic Mass Number ___ Number of Protons ___ - Atomic Number ___ Number of Electrons ___ Number of Neutrons ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ ______________ ___ Nickel -- ___ Manganese -- ___ Argon -- ___
