Ps Ch 4: Question Preview (ID: 4713)

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Avogadro's number is useful for
a) counting atoms
b) counting large objects
c) locating an atom's electron
d) none of the answers are correct

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) 12.01 g
d) 0.012 g

The charge of an atom is
a) positive
b) neutral
c) negative
d) unblanaced

An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have
a) 30
b) 56
c) 26
d) 82

How much effect do commonly found isotopes have on the average atomic mass of an element
a) less than rarely found isotopes
b) no effect on atomic mass
c) same as rarely found isotopes
d) more than rarely found isotopes

An element's atomic number is equal to its number of
a) protons
b) neutrons
c) valence electrons
d) number of electrons

Two different isotopes of an element have different
a) numbers of neutrons
b) numbers of protons
c) numbers of electrons
d) atomic numbers

What is the mass number of an element that has 19 protons,19 electrons and 20 neutrons
a) 19
b) 20
c) 39
d) 58

A sodium atom, which has 11 electrons has ___ electrons in its third energy level
a) 0
b) 1
c) 2
d) 8

Unlike the modern model of the atom, Bohr's model states that
a) electrons move in set paths around the nucleus of an atom
b) atoms cannot be divided into smaller parts
c) electrons behave like waves
d) electrons contain orbitals

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