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32 Cards in this Set

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  • Back
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Element
basic building blocks of matter
Atom
smallest unit of an element, still having the properties of that element
Compound
a substance made up of 2 or more elements
Molecule
smallest unit of a compound
subatomic particles
electron (-), proton (+), neutron (0), make up atoms
atomic number
number of protons
Atomic Mass
number of protons + number of neutrons
Nucleus
contains protons and neutrons
Isotope
a version of an element with a different number of neutrons
Valence electrons
electrons in outer shell
Noble gases (group VIIIA)
outer-most shells are completely filled (2 or 8 e-) and so are very stable
Why are there decimals in atomic mass?
The periodic table lists weighted average atomic mass of all isotopes of that element
Rows
"periods"
Columns
"groups" or "families"
Period number
Identifies outermost shell number
Diatomic molecules
Elements that usually are found in pairs
(H2, N2, O2, F2, Cl2, Br2, I2)
electronegativity
The measure of the afinity for electrons
-F is the most electronegative element
-electronegativity decreases as you move down the periodic table
Ionization Energy
the energy required to pull away an electron

-ionization energy increases as you move down (to the right) the periodic table
Atomic Radius
distance from the necleus to the outermost electrons
ur cute
Stoichiometry
Math in chemistry
Think of balancing equationsur cture i hate bkm
empirical formula
the smallest whole number ratio of elements in a compound
ilana sucks
Chemical formula
The actual formula of the compound
Atomic Mass
1. The number of protons + neutrons
2. The mass of the element in grams per mole
3. The mass of 1 atom of the element in atomic mass units
mole
a number - 6.02 x 10^23
A UGLY ANImal
Anions
Negatively charged ions
Cation
positively charged ion
+
1. Intermolecular bonds

2. Intramolecular bonds
1. Bonds between molecules that are caused from positive and negative charge. (weaker than intra. bonds)

2. Bonds between elements that are caused from sharing electrons. (stronger than inter. bonds)
Hydrogen bond
formed between 2 molecules that have a H and a (F or O or N)

[intermoleculer bond)
Covalent Bond
Formed when 2 atoms share valence electrons
brianne killed bay
Ionic Bond
formed when 2 ions of opposite charge come together
kill ilana
Non-polar Molecule
any partial charges are cancelled out
'Polar' molecule
has side with opposite partial charges

-only a polar molecule if polar bonds dont cancel
hi :)