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19 Cards in this Set

  • Front
  • Back
matter
anything that occupies space and has mass
element
form of matter cannot be broken down into sumpler form by ordinary chemical means
atom
smallest particles that can exist an still maintain the properties of an element
nucleus
central portion of an atom containing virtually all its mass made of 2 dif types of small particles
protons
+ charge, number cannot change in nucleus
atomic number
number of protons in nucleus, used an identifying characteristic of atoms, number of which cannot change
neutrons
uncharged particles in the nucleus number of which can change from one atom to another
isotope
atoms in which # of nuetrons has been changed, often radioactive or fluorescent which allows them to be used in nucleur medicine
atomic mass
# of protons and neutrons in an atom, value is changable by adding or subtracting neutrons
electron cloud
outer portion of an atom occupying all of an atom's space but havng no mass. 2 dif atoms can band together by sharing portions of their clouds
electrons
extremely small changed particles surrounding the nucleus moving at set distances and in a particular path around the nucleus
ions
atoms with electric charge formed by gaining or losing electrons
orbitals
pathways electrons folow as they move around the nucleus-2 atoms sharing an orbital forming a powerful bond between them
molecule
paticles formed by 2 or more atoms sharing electrons or being attracted by other forces
covalent bonds
most powerful type of molecular bond created by 2 or more atoms sharing at least one other oribtal between them
organic compounds
make up the majority of living cells solid mass and carry out metabloic functions that keep cells alive
nucleic acids
DNA and RNA found mainly in the nucleus of a cell responsible for controlling a cell's activities by controlling the production of protein and are responsible for passing traits from one generation to the next
nucleotide
basic unit of nucleic structure made of a phosphate group of simple sugar ad one of 4 different chemical bases
proteins
most organic compound in cells provides a cell structure actr as enzymes, pigments, toxiants, antibodies, hormones and transport mechanisms. serve as energy under starvation conditions