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Ps Ch 4
Test Description: Atoms
Instructions: Answer all questions to get your test result.
1) Avogadro's number is useful for
A
none of the answers are correct
B
counting atoms
C
locating an atom's electron
D
counting large objects
2) What is the molar mass of an element with an average atomic mass of 9.012 u
A
0.012 g
B
6.022 x 10E(23) grams
C
12.01 g
D
9.012 g
3) The charge of an atom is
A
unblanaced
B
negative
C
positive
D
neutral
4) An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have
A
56
B
82
C
26
D
30
5) How much effect do commonly found isotopes have on the average atomic mass of an element
A
no effect on atomic mass
B
more than rarely found isotopes
C
same as rarely found isotopes
D
less than rarely found isotopes
6) An element's atomic number is equal to its number of
A
number of electrons
B
valence electrons
C
protons
D
neutrons
7) Two different isotopes of an element have different
A
numbers of protons
B
numbers of neutrons
C
numbers of electrons
D
atomic numbers
8) What is the mass number of an element that has 19 protons,19 electrons and 20 neutrons
A
20
B
58
C
19
D
39
9) A sodium atom, which has 11 electrons has ___ electrons in its third energy level
A
8
B
0
C
2
D
1
10) Unlike the modern model of the atom, Bohr's model states that
A
electrons behave like waves
B
electrons move in set paths around the nucleus of an atom
C
atoms cannot be divided into smaller parts
D
electrons contain orbitals
*select an answer for all questions
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