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EARTH SCIENCE HOMEWORK, Ch. 2, Sec 1
Atoms and subatomic particles
Fill in the blanks with the correct word(s) from the text.
1. The Greek philosopher Democritus proposed that matter is
composed of small particles. He called these particles ________.
(pg. 36, P2)
2. Three basic particles make up an atom: ____________,
__________, and ___________. (pg 36, P3)
3. __________ are particles that have a positive electric charge. (pg.
36, P3)
4. _________ have no electric charge. (pg. 36, P3)
5. Particles with a negative charge are called ________ and they
exist outside the nucleus. (pg. 36, P4)
6. In an atom, electrons can be grouped into _________ levels, each
holding only a specific number of electrons. (pg. 36, P5)
7. All atoms of the same element have the same number of
________ .(pg. 37, P1)
8. The number of protons in an atom is equal to the _________
__________ (2 words) of the element. This number is found
above each element’s symbol on the periodic table. (pg. 37, P1)
9. In a neutral atom (with no charge), the number of ________ is
equal to the number of _________. (pg. 37, P2)
Atoms of an element can lose or gain electrons and still be the same
element. When this happens the atom is no longer neutral.
10.
Atoms with fewer electrons than protons have a _________
charge. Atoms with more electrons than protons have a ________
charge (pg. 37, P3)
11.
The _________ ___________ of an atom is equal to the
number of protons plus the number of neutrons. (pg. 37, P4)
12.
Atoms of the same element that have different numbers of
neutrons are called ________. (pg. 37, P4)