biology unit 2 quiz 2 lesson 1

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protons, neutron, electrons

three subatomic particles

neutron

carries no electrical charge

electron

carries the negative charge

proton

carries the possative charge

Neucleus

the mass of an atom is contained primarily in its

Atomic , neutrons

______mass is determined by the number of protons plus the number of_______

protons

the atomic number is determined by the number of

neutral

atoms are electrically _____ because they have the same number protons as electrons

carbon, hydrogen, oxygen, nitrogen

the principle elements in living things are

four elements that make up over 95 percent of the human body are

carbon, hydrogen, oxygen, nitrogen

92

how many elements have been found to occurr in nature

lavoisier

the eighteenth century chemist who proposed that all matter is composed from the same elements

diatomic, atom, element

Many gases exists as a ______ molecule of an ______ or ________

molecule

the smallest complete unit of a compound or diatomic gas

compound

a new sunstance formed by the combination of two or more different atoms

shell

path of electrons around an atomic nucleus

element

a substance consisting of only one type of atom

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