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The Atom Notes What are Atoms? Atoms are the _______________ __________________of matter. All matter is made up of __________________. How big is an atom demonstration: Answer: If you were to cut the paper in half about _______________ times, you would be around the size of the atom. We can’t see ______________________atoms. We can see billions and billions of them ________________ together. An atom is made of 3 parts: _________________, _____________________, & _________________________ Protons have a _____________________ charge. Found in the __________________ (center) of the atom. Neutrons have a __________________ charge. Found in the _______________of the atom Electrons are the _________________________of the subatomic particles. Electrons have a _______________ charge. Found in _________________or _____________________that surround the nucleus Atoms Form Elements: Different atoms have _________________ numbers of protons, __________________, and electrons Each of the different elements from the Periodic Table ________________ has a _________________ amount of protons, neutrons, and electrons in its _____________________ An atom that has 1 proton, 1 electron, and 0 neutrons is the element _________________________, whereas an atom that has 2 protons, 2 electrons, and 2 neutrons is the element ______________________. Atomic Number – the number of ________________________ in a atom Atomic Weight/Mass – the number of __________________ and _________________ in an atom Number of ___________________________= number of _________________________ Number of _______________________________ = atomic _________________________ - atomic ________________________ Niels Bohr - Came up with a “___________________________________” of the structure of an atom , won Nobel prize in _______ Bohr Model Bohr discovered that ________________________________ move in orbitals _______________________the nucleus of an atom. Although, we don’t know exactly where electrons are at any given time, we now have a model that helps scientists estimate where electrons are likely to be located at any given time. To draw a Bohr model we need to know how many protons, neutrons, and electrons are in the atom. HELIUM ATOM: Draw and label its parts: Atomic Structure: Electrons are arranged in Energy _____________________ or Shells around the nucleus of an atom. • first shell a maximum of ________________electrons • second shell a maximum of ________________ electrons • third shell a maximum of ________________ electrons Bohr Model of Carbon How many protons? _____________ How many electrons? _________________ How many neutrons? _________________________ How many electrons can go in the first shell? _____________________________ How many electrons do we have left? ___________________________ These will go into the second shell. Only 2 electrons shells needed for Carbon What are Molecule? Two or more atoms of the same or different elements that _________________ together. What is a Compound: is a pure chemical substance consisting of two or more different chemical _________________ that can be ____________________________into simpler substances by chemical _____________________________________.
