1. Atomic Theory
Matter is composed of tiny building blocks, or particles, called ATOMS.
Atoms are composed of three types of subatomic particles: PROTONS, NEUTRONS, and ELECTRONS.
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2. Subatomic Particles
Particle Symbol Charge Relative Mass Electron e Proton p Neutron n 0 1
How big are electrons compared to protons and neutrons?
See Scaling the Universe:
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3. Location of Subatomic Particles
Protons and neutrons are located in the atom’s NUCLEUS.
Electrons are found in a cloud surrounding the protons and neutrons.
How far away are the electrons?
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4. How many types of atoms are there?
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5. Did I Get It?
All matter that exists in the universe is made up of _________________, which are the smallest units of matter.
2. The different types of ________________ are called ____________________. We know of about 118 of these, and we keep track of them in the _____________________________________________.
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6. How to read the Periodic Table
Pick one of the boxes from the Periodic Table of Elements, and re-draw it here.
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7. Atomic Mass on the Periodic Table11 Na
22.99
Atomic Number
Symbol
Atomic Mass
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8. Elements Atoms of the same type can combine to form ELEMENTS.
Au atoms combine to form gold
Ag atoms combine to form silver
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9. Atoms and molecules
Single atoms can share or trade electrons to form BONDS.
Two or more atoms bonded together is called a MOLECULE
Atom
Bond
Molecule
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10. Where are all the Elements organized into one handy place?
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