Unit 1
a substance that is capable of causing the illness or death of a living organism when introduced or absorbed ?
poison
one of the tiny particles inside an atom; it has a negative electric charge.?
electron
the first group of the periodic table
alkali metal
atoms or molecules that gain electrons and become negative ions
anion
a chemical covalent bond in which two pairs of electrons are shared between two atoms
double bond
animals that lives by killing and eating other animals
predator
an atom’s electrons are arranged around the nucleus in shells, each of which can hold a certain number of electrons before it is full?
electron shell
the second group of the periodic table
alkaline earth metal
atoms or molecules that lose electrons and become positive ions?
cation
a pair of valence electrons that are not shared with another atom in a bond;sometimes also referred to as an “un-shared pair"
lone pair of electrons
animals that are eaten by others?
prey
one of the tiny particles in an atom; it has no electric charge.?
neutron
a column within the periodic table, in which the elements have the same number of valence electrons
group
an atom that has lost or gained one or more electrons and as a result has either a positive or a negative electric charge?
ion
a chemical covalent bond in which three pairs of electrons are shared between two atoms
triple bond
a poisonous substance that is produced within living cells or organisms?
toxin
the center of an atom, where the protons and neutrons are contained?
nucleus
the seventh group of the periodic table, the second-to-the-last group
halogen
a type of chemical bond where one or more electrons are passed from one atom to another,creating two ions of opposite charge that attract each other?
ionic bond
a substance produced by a chemical reaction
product
The process of light emitted by living things through chemical reactions.?
BioLuminescence
one of the tiny particles inside an atom; it has a positive electric charge.
proton
the eighth group of the periodic table, the last group
noble gas
atoms will lose, gain, or share electrons to achieve only entirely filled valence shells; referred to as the octet rule because Periods 2 and 3 have 8 electrons in their valence shell
octet rule
a substance that is changed in a chemical reaction
reactant