chem: atoms, elements and compounds

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11 Terms

1
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what is the average radius of an atom?

0.1nm or 1 x10^-10m

2
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is the nucleus of an atom positive or negative?

positive

3
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what is the average radius of the nucleus of an atom?

1 x 10^-14m

4
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where is the mass concentrated in an atom?

in the nucleus

5
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electrons are tiny but…?

cover a lot of space

6
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protons and… have the same number in an atom

electrons

7
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what does the atomic number tell you?

number of protons

8
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what does the mass number tell you?

total number of protons and neutrons

9
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what subatomic particle tells you the type of atom?

the number of protons

10
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which subatomic particle has a different amount in isotopes?

neutrons

11
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what is the equation for relative atomic mass(Ar)

sum of(isotope abundance × isotope mass number) ÷ sum of abundances of all isotopes