1
Q
atom
A
smallest particle that retains the properties of an element
2
Q
electron
A
- negatively charged
- found outside the nucleus
- insignificant mass (9.1x10^-28)
3
Q
proton
A
- positively charged
- found inside the nucleus
- atoms of the same element have the same # of protons
- mass of 1.67x10^-24g
4
Q
neutron
A
- neutral
- found inside the nucleus
- same element can have different # of neutrons (isotopes)
- mass of 1.67x10^-24g
5
Q
isotopes
A
- atoms of the same element/atomic number
- different # of neutrons + mass numbers
6
Q
atomic number
A
Z
number of protons in an atom
7
Q
mass number
A
A
number of protons + neutrons
8
Q
actual mass of atom
A
(mass #) (1.67x10^-24g)
9
Q
Avogadro’s number
A
6.02x10^23
10
Q
DA conversion
A
1 mole = 6.02x10^23 = atomic mass (grams)
11
Q
nucleus
A
- very dense
- protons and neutrons here
12
Q
nuclear radius
A
3√A(1.4x10^-13)
13
Q
volume of nucleus
A
4/3πr^3
Chemistry
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