Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
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 element of the periodic table is made of only one kind of atom. Atoms are Parts of an atom composed of subatomic Neutral atoms In a neutral atom, the positive charges of the protons are balanced by the particles called protons, neutrons, and electrons. negative charges of the electrons. Neutrons are neutral and do not affect the charge 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 atomic number represents the number of protons. Ex.) The atomic number for Oxygen is 8. That means all atoms of oxygen have 8 protons. Atomic Number = Number of Protons 2. Identify the number of electrons. In a neutral atom, the number of positive charges must be balanced by an equal Number of electrons number of negative charges. Ex.) Fluorine has an atomic number of 9. That means there are nine positively charged protons. Since it is a neutral atom, it also has 8 negatively charged electrons. Atomic Number = Number of Protons = Number of Electrons A P E (all three are equal in a neutral atom!) 3. Identify the number of neutrons. Round the atomic mass to the nearest whole number. The atomic mass represents the number of protons plus the number of neutrons in the nucleus. A.) Fluorine has an atomic mass of 18.998. Round it to the nearest Atomic mass whole number which is 19. B.) To find the number of neutrons: Atomic Mass Number Ape man = Number Number of Neutrons 19 - 9 = 10 M - A = N Atomic Remember Atomic - Number A Atomic Mass Number M = Number of Protons = P = Atomic - = Number - = A = Number of Electrons E Number of Neutrons 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 -- ___