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Dalton's atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and
atoms of different elements could form to join compounds
Group 18 noble gases are relatively inert because
their s and p orbitals are filled.
Electrons in the outer energy level of an atom are called _____?
This determines an element's ______?
Valence electrons (which account for similar chemical properties)
Family/Group (columns)
It is possible for different covalent compounds to have the same empirical formula because empirical formulas represent
a ratio of atoms in the compound
A mole is an SI base unit that describes the
amount of a substance
According to Rutherford's model of the atom, electrons behave like
Planets orbiting the sun
Which element is a semiconductor?
silicon
An atom gains energy by absorbing a light particle called a(n) _ .
photon
Alkanes are hydocarbons that contain
single covalent bonds only
If the average atomic mass of carbon is 12.01 u, 1 mole of pure carbon will have a mass of
12.01g
The first theory of atoms, proposed by _ , suggested that the universe was made of units that could not be divided.
Democritus
A group's elements react similarly because of their _ .
valence electrons
Covalent bonds are formed between
nonmetal atoms
A(n) _ bond is formed when atoms share _ of electrons.
covalent
pairs
Isotopes of an element have the same atomic _ but different atomic _ .
number
masses
In his version of the periodic table, Mendeleev based his arrangement of the element on an element's
Atomic mass
Elements within the same group in the periodic table have similar properties because they have the same number of
valence electrons
When two atoms bond, the positive _ of one atom attracts the negative _ of another.
nucleus
electron(s)
A compound's _ formula tells you how many atoms of each type are in one molecule.
molecular
A(n) _ is a polymer made of bonded amino acids.
protein
Thomson's model was famous for proving what subatomic particle?
the electron
The name dinitrogen tetroxide tells you that this compound contains
2 N atoms and 4 O atoms