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12 terms

Atoms, Elements and Compounds

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Proton
a subatomic particle that has a positive charge and that is found in the nucleus of an atom
Neutron
a subatomic particle that has no charge and that is found in the nucleus of an atom
Electron
negatively charged particle; located outside the atomic nucleus
Mendeleev
Russian chemist who developed a periodic table of the chemical elements and predicted the discovery of several new elements (1834-1907)
Atomic Number
the number of protons in the nucleus of an atom
Atomic Mass
total mass of the protons and neutrons in an atom, measured in atomic mass units
Positively Charged Atom
more protons than electrons
Negatively Charged Atom
more electrons than protons
Noble Gas
any of the chemically inert gaseous elements of the helium group in the periodic table
Limewater Test
when CO2 is mixed with lime water, it makes calcium carbonate (blew through straw into lime water, gave off CO2) and the limewater turns milky- proving the existence of CO2
Splint Test
Identifies common lab gases (O2) by inserting a glowing wooden splint into a test tube with unknown gas
Pop Test
The captured gas is lit and if it makes a 'pop' sound then it is known to be hydrogen gas