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Atomic Structure
Atomic Structure
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1
To determine the molar mass one an element, one must know the element's
number of isotopes
average atomic mass
atomic number
Avogadro constant
2
All atoms of the same element have the same
mass number
atomic number
atomic mass
number of neutrons
3
Which of the following is the correct statement?
6.02 x 1023 atoms Na = 1 gram Na
22.9g Na = 1 mol Na
22.9 atoms Na = 1 mol Na
6.02 x 1023 grams Na = 1 mol Na
4
The smallest unit of an element that can exist alone or in a compound is the
neutron
proton
electron
atom
5
When elements react, the mass of the compound is _____ the sum of the mass of the elements.
less than
neither greater or less than
equal to
greater than
6
Chadwick discovered which subatomic particle?
quark
electron
proton
neutron
7
The total # of neutrons & protons in the nucleus of an atom is its
Avogadro's number
mass number
atomic number
average atomic mass
8
According to Dalton's theory, atoms
of each element are identical
can be divided
of different elements cannot be combined
are destroyed in chemical reactions
9
Which concept of Dalton's theory has been modified?
Atoms cannot be divided.
Atoms can combine in chemical reactions.
All matter is composed of atoms.
Atoms of different elements have different properties.
10
The SI unit of molar mass is
mole/gram
gram
mole
gram/mole
11
Avogadro's number is
the mass of particles in 1 gram of a substance
the number of protons & neutrons in the nucleus
the maximum # of electrons an atom has
the number of particles in one mole of a substance
12
The charge on a single electron was calculated by
Chadwick
Thomson
Rutherford
Milliken
13
In oxides of nitrogen (NO, NO
2
, N
2
O), atoms combine in small whole number ratios. This is evidence of
the law of mass action
the law of multiple proportions
the law of conservation of mass
the law of definite composition
14
The atomic mass listed on the periodic table is the
atomic mass of the most abundant isotope
mass number of the most abundant isotope
average atomic mass of all the isotopes of that element
atomic mass of the most stable isotope
15
Which particle was discovered using a cathode ray tube?
proton
quark
neutron
electron
16
An atom is electrically neutral because
neutrons balance protons & electrons
the number of protons & neutrons are equal
the number of protons & electrons are equal
nuclear forces stabilize the charges
17
If the samples of two different elements each represent one mole, then
they have the same atomic mass
they contain the same number of atoms
their molar masses are equal
they are equal in mass
18
The concept that matter is composed of tiny indivisible parts was originally proposed by
Aristotle
Lavosier
Dalton
Democritus
19
Molar mass
the mass of protons & neutrons in the nucleus
is the mass in grams of one mole of a substance
the volume of electrons in the atom
is numerically equal to the average atomic mass
20
Most of the volume of an atom is occupied by the
nucleus
electron cloud
protons
neutrons
21
Isotopes of an element contain different numbers of
protons
electrons
neutrons
nuclei
22
Nuclear forces exist because the particles in the nucleus are
highly energized
moving fast
close together
oppositely charged
23
Who discovered the nucleus by bombarding gold foil with positively charged particles?
Rutherford
Chadwick
Thomson
Dalton
24
According to the law of definite proportions, any two samples of KCl have
the same ratio of elements
the same melting point
the same mass
slightly different molecular structures
25
Which subatomic particle has almost no mass?
alpha particle
proton
electron
neutron
