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As going across groups and down on periods, elements get heavier

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As going across groups and down on periods, elements get heavier

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1. Rutherford Atom Model
2. Democritus Atom Model
3. Dalton Atom Model
4. Bohr Atom Model
5. Quantum Atom Model

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Covalent Bonding -  is between non-metals

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Covalent Bonding -  is between non-metals

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Ionic Bonding - is between metals and non-metals

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Ionic Bonding - is between metals and non-metals

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Metallic Bonding - is between metals and metals

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Metallic Bonding - is between metals and metals

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Elements: always has the same number of protons, electrons and neutrons.
Protons: Positive charges found in nucleus
neutrons; subtract protons from atomic mass
Atom: Smallest particle of an element
Atomic Number: the number of protons in an element
Mass Number: number of protons + number of neutrons

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We think chemical bonding is the way that chemicals combine to make something new
-Sarah & Klejda

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1st: 2 electrons max
2nd: 8 electrons max
3rd: 8 electrons max
4th: 2 (for the moment)

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The big letter in one of the elements is the symbol for the element. The small number above the symbol indicates the atomic number, which determines the number of protons and electrons. The little number under the symbol indicates the number of neutrons plus the number of protons.

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1. Covalent
2. Ionic