Bio - CHAP 1
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anything that takes up space and has mass
A substance that cannot be broken down to other substances by chemical reactions
A substance consisting of two or more different elements combined in a fixed ratio
A compound has characteristics different from those of its elements
Essential Elements of Life
Carbon (c), Oxygen (O), Hydrogen (H), Nitrogen (N) make up 96%.
Phosphorus (P), Sulfur (S), Calcium (Ca), Potassium (K) and a few others make up the remaing 4%.
those requried by an organism in only minute quantities
smallest unit of matter that still retains the properties of an element
the even smaller parts of the atom which consists of the proton, electron and neutrons
electrically neutral subatomic particles
positively charged subatomic particles
Negitively charged subatomic particle
at the center of the atom
protons give the nucleus a postive charge with negitively charged electrons form a cloud around it
a unit of measurement used for atoms, subatomic particles, and molecules
the dalton is the same as the atomic mass unit (amu)
The number of protons in an atom
which is unique to that element
written as a subscript left of the symbol for the element ----->>(2He)
this number tells us that the helium atom has 2 protons in the nucleus
Unless indicated otherwise, atoms are neutral in electrical charge and therefore has the same number of electrons
Sum of protons and neutrons in the nucleus of an atom
written as superscript to the left ----->>(24He)
you can determine the number of neutrons by subtracting the number of protons (atomic nubmer) from the mass number
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