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What makes up all matter in the universe ? ATOMS What are the three parts of an atom ? Protons, Neutrons, and Electrons What is the NUCLEUS of an atom ? It is the center of the atom made up of Protons and Neutrons. What is a PROTON ? It is the positively charged particle in the center of the ATOM What is a NEUTRON ? It is the neutrally charged particle in the center of the ATOM What is an Electron ? It is the negatively charged particle on the outside of the ATOM What is The Atomic Number ? The number of Protons in an ATOM. What is equal to the number of PROTONS in an ATOM ? The number of Electrons in an ATOM. What is The Atomic Mass ? The number of Protons plus the number of NEUTRONS in an ATOM. Why are Electrons not included in the Atomic Number ? They have almost no mass. What is the BOHR’s model? A way to understand the organization of an ATOM. The first ring can hold = 2 electrons. The second ring can hold = 8 electrons The third ring can hold = 18 electrons Critical thinking: If the ATOMIC number is 3, then how many Protons does the ATOM have ? 3 PROTONS Critical thinking: If the ATOMIC number is 3, then how many Electrons does the ATOM have ? 3 Electrons On your own paper, create an Atom model with an Atomic Weight of 5 On your own paper, create an Atom model with an Atomic Weight of 5 Homework Due Tuesday: Page 130 #1.a.b.c.. (complete sentences). Wednesday’s In class work: You will get 2’’x2’’ papers. On one side you will draw the bohr’s model of four atoms. On the other side you will copy the information from the periodic table