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