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Atomic Structure

Terms in this set (20)

neutrally charged subatomic particles with a mass of 1 amu; located in the nucleus
neutron
smallest unit of matter
atom
the outer portion of an atom that contains electrons; where most of the volume of an atom is located
electron cloud
the center of the atom that contains neutrons and protons; where most of the mass of an atom is located
nucleus
positively charged subatomic particles with a mass of 1 amu; located in the nucleus
proton
the average mass of all atoms of an element
atomic mass
the rounded mass of an atom; protons + neutrons
mass number
the number of protons in an atom; the number that identifies an element
atomic number
the distance of electrons in the electron cloud from the nucleus; the 1st 3 levels can hold 2, 8, and 8 (also known as shells)
energy level
describes the ratio of the atoms of a particular substance (water = H2O)
chemical formula
shows how reactants form products (2H2 + O2 ---> 2H2O)
chemical equation
the chemical formula(s) on the left side of the chemical equation
reactants
the chemical formula(s) on the right side of the chemical equation
products
mass cannot be created or destroyed; reactants must equal products
law of conservation of mass
the number to the bottom right of an element; tells you the number of atoms of an element
subscript
Verified questions
PHYSICAL SCIENCE
Is acceleration directly proportional to mass, or is it inversely proportional to mass? Give an example.
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CHEMISTRY
Elements in the same group of the periodic table often form oxyanions with the same general formula. The anions are also named in a similar fashion. Based on these observations, suggest a chemical formula or name, as appropriate, for each of the following ions: $$ BrO_4^- $$
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CHEMISTRY
Describe two ways in which the biosphere has influenced the composition of Earth's crust.
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CHEMISTRY
The argon fluoride (ArF) laser used in some refractive eye surgeries emits electromagnetic radiation of 193.3 nm wavelength. What is the frequency of the ArF laser's radiation? What is the energy of a single quantum of the radiation?
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