Atoms and Elements
Atoms: the smallest whole particle of matter.
­groups of atoms make up molecules
­groups of molecules make up substances.
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Electrons ­
Negatively charged
particles.
Protons­
Positively charged
particles
Neutrons­
Nucleus ­ Made up of Protons and Neutrons
Have no charge
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What is an element and how many are
there? How are they sorted?
Elements - Substance made up of only 1
type of atom.
There are more than 100 elements
They are sorted by size and structure in the Periodic Table
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What facts can you
tell me about a gold atom
based on its chemical
symbol?
Atomic Number: 79
Atomic Mass: 196.966569
Mass Number: 197
Protons: 79
Neutrons: 197-79 = 118
Electrons: 79
What can you conclude about this element compared to
other elements you know about?
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