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Glossary of Unit 2 Chemistry Test Vocabulary

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atom
the smallest particle of an element that retains the specific properties of that element
atomic number
the number of protons in the nucleus
mass number
the mass of the atom (protons + neutrons)
neutrons
mass # - atomic #
neutral atom
an element where # of protons = # of electrons
* assume any element on the periodic table is a ____________ _______
ion
an element that has gained or lost an electron to get a + or - charge
cation
+ charge -----> lose electrons
anion
- charge -----> gain electrons
isotopes
elements with the same atomic number (same protons) but different masses, due to a different number of neutrons
mole
SI unit for amound of substance
molar mass
mass of one mole
Avogradro's number
6.02x10(to the 23) power
protons and neutrons
an atoms nucleus contains ___________ and _________
alpha
it is a particle with 2 protons and 2 neutrons bound together making it basically a Helium nucleus
beta
oarticles with high-energy electrons or positrons
gamma
not a particle, but a radiation with high-energy photons

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