Download Elements, Compounds, and Atoms Video Notes

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Elements, Compounds, and Atoms Video Notes
1. Pure substance – matter made of 1 kind of material with
.
2. Element - simple pure substance that can’t be changed into a
.
3. atmos – Greek word for “
” or “indivisible”.
4. Atom – the smallest piece of matter that
broken down.
be commonly
5. John Dalton – An English chemist whose work led to widespread
acceptance of the idea of the existence of
.
1. All matter is made of
that can be combined.
2. Atoms of same element are
.
3. Atoms of different elements are
.
4. Atoms of two or more elements can be combined to form new
.
6. Thomson’s Model of the Atom – late 19th century scientist who
stated atoms were not simple solid spheres.
He discovered
.
7. Electrons – small particles located outside the nucleus and have a
charge.
8. Ernest Rutherford’s Model of the Atom – developed a more
complete understanding of the structure of atoms. He used gold foil
and gold atoms. He discovered that atoms are mostly
made of
.
9. Nucleus – positively charged
particles are scattered outside the nucleus around the
of the atom. Negatively charge
of the atom.
10. Neils Bohr – proposed that electrons orbit around the nucleus; each electron has a fixed
amount of energy and electrons orbit in
around the
nucleus. (Think of the rungs on a
.)
11. Electron Cloud Model – the region where electrons would probably be found swirling
around the
of an atom.
12. Compounds – pure substance made of more than 1
.
13. Molecules – 2 or more atoms with specific properties that have
together.
14. Chemical symbol – 1 or two letters used to represent an
15. Chemical formula –
for chemical substances.
.