A
anything that contains mass and occupies space
Matter
2 or more elements in a fixed ratio (CO2,H2O,NH3)
Compound
Number of protons and the number of electrons in a neutral atom
atomic number
What do we call the outermost electron shell
Valence shell
Atoms share the electrons equally
non-polar covalent bond
what is the smallest unit of matter?
an atom
Substance that CANT be broken down to other substances by chemical reactions is an
element
Elements sum of protons plus neutrons in the nucleus
mass number
How many electrons are found in the innermost electron shell?
2
one atom is more electronegative and the atoms do not share the electrons equally
Polar covalent bond
what are atoms made up of? What makes up this item?
Subatomic particles: protons, neutrons and electrons
What do we call elements required for life
essential elements
number of protons + neutrons
atomic mass
Atoms tend to establish completely full outer energy levels. This rule is called
the Octet rule
sharing of one pair of valence electrons is what type of bond
a single bond
an electron
Elements required by an organism in minute quantities
trace elements
atoms of same elements that possess different numbers of neutrons
isotope
Chemical behavior of an atom is determined by what?
valence electrons
sharing of two pairs of valence electrons is what type of bond
double covalent bond
What is a neutrally charged subatomic particle
Neutron
Oxygen, Carbon, Hydrogen, Nitrogen
Hydrogen bonds are strong or weak in comparison to ionic and covalent bonds?
weak
Boron has an atomic number of 5. How many electrons will an atom on Boron have in its valence shell?
3
An atoms affinity for the shared electrons in a covalent bond
Electronegativity