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30 Cards in this Set

  • Front
  • Back
All matter is comprised of what?
matter
What is matter?
anything having mass and occupying space
What is Mass?
a measure of the amount of matter that an object contains
Mass Weight
the measure of how strongly and object is pulled by earths gravity and consequently varies as a function of distance from the earths center. Mass does not vary with its position.
Biologically Important Elements
92 naturally occuring elements

25 are essential for life
96% of all living matter
C,O,H and N
remaining 4% of all living matter
Ca, P, K, S, Na, Cl, Mg, and trace elements
Trace Elements
Although in very small quantities are very important
Compounds
two or more compounds combined in a fixed ratio
Atom
smallest possible unit of matter that retains the physical and chemical properties of its element, all atoms of the same element share the same chemical properties.
What does the atomic structure determine?
the behavior of an element
Atams are comprised of subatomic properties, what are they?
Neutrons, protons, and elctrons
Nucleus
dense core of the atom
What is the nucleus's charge?
it is positively charged-neutrons and protons are positivly charged only
Electrons
...are held in orbits by the electrostatic attraction to nuclear protons
Dalton
unit of mass equal to 1.67 x 10-24 g
Atomic number
equal to the number of protons in a particular element
What is the same of all atoms of a particular element?
the atomic number
In a neutral atom, the number of electrons equals the number of what?
protons
Mass Number
the number of protons and neutrons in a particular element
Nomenclature
23 Na (sodium has a total of 23 neutrons and protons
Knowing both the atomic number and mass number you can determine the number of what?
neutrons (23-11=12)
Mass number is an approximate measure of what?
the mass of an atom since proton and neuton mass are approximatly 1 dalton
Atomic Weight
the weighed mean of the masses of an element's constituent isotopes
Isotope
the of an element that have the same atomic number but different mass number
Isotopes must have...
the same number of protons and different number of neutrons
Energy
the ability to do work
potential energy
energy stored by matter due to its position or location
Energy levels of electrons
electrons are negetively charged particles that orbit around the nucleus
-equal in mass and size
-involved in chemical reaction
-have potential energy
electron shells
fixed potential energy states