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Erin Howe Inglés 11 fichas

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1protonsymbol-p
location- nucleus
relative mass- *1*
relative charge- 1+
2neutronsymbol- n
location- nucleus
relative mass- *1*
relative charge- neutral
3electronsymbol- e
location- in the shells around the nucleus
relative mass- nearly nothing
relative charge- 1-
4atomic numberEach element has a set number of protons that is the atomic number of an element.
(protons and electrons are the same number)
5Mass numberthe number of protons and the number of neutrons
6isotopesan element with a different number of neutrons
7elementa material with only one type of atom
8compoundtwo or more elements bonded together
9shellselectrons in atoms occupy energy levels also called electron shells, outside the nucleus. Different shells can hold different maximum number of electrons.
10average atomic massexample
80% of all boron is B 11 (6 neutrons)
20% of all boron is B 10 (5 neutrons)
80x11=880 20x10=200
1080/100=10.8
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