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### 17 Cards in this Set

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 What are Subatomic Particles? Particles that are small compared to an atom. Protons, Neutrons, Electrons are Subatomic Particles that make up an atom. What makes up an Atom? What is the nucleus in terms of an Atom? positively charged center of an atom. Think about where you can find the nucleus in the atom and what subatomic particles are contained in it. What is a Proton? Subatomic particle in the nucleus of an atom. Has a positive electric charge. AMU (Atomic Mass Unit) Unit of measurement for atomic mass. Mass Number Atomic mass rounded to nearest whole number. Atomic Mass combined mass of all particles, protons, neutrons, electrons. Electron Subatomic particle located on the outside of a nucleus. It has a negative charge. Energy Level path of electrons around nucleus. What does the atomic number determine? The number of protons in the nucleous of one atom of the element. Because an atomic is neutral, it also determins the number of electrons surrounding the nucelous. For example, according to the Periodic Table, Neon (Ne) has an atomic number of 10. If atomic mass is 20.18, then it cannot be its mass number so it must be the Atomic Number. Now what # of subatomic particles doe it determine? Using the "rule" set by the atomic number, how can we determine the number of neutrons? We take the number of protons and electrons as determined by atomic number and subtract it from the Mass number (atomic mass rounded to nearest whole number). That gives you how many neutrons there are. What does AMU stand for? Atomic Mass Unit. How many AMUs is a proton or a neutron? One. Protons and Neutrons are so close in weight that we round it to the nearest whole number. How many electrons can be contained in an atom's 1st primary energy level? 2nd Primary Energy Leve? 3rd Primary Energy Level? max 2, max 8, max 18 How do we organize the Bohr Model? # of protons and neutrons go in the nucleous and # of electrons go on each energey level respectively. What is the Phil Order? 1s2-2s2-2p6-3s2-3p6-4s2-3d10-4p6 You can also use the "zig zag" for visual help. Using Neon, with an atomic number of 10, what would be its electron configuration? 1s2 2s2 2p6 #22 Titanium? 1s2 2s2 2p6 3s2 3p4