How Atoms Differ

Quiz by Cheryl Morton

High School
Chemistry (2017)
Texas Essential Knowledge and Skills (TEKS)

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5 questions
• Q1

Why are all atomic masses not nearly whole numbers?

this is due to the mass of all the electrons in the atom

this is because of experimental error

this is due to binding energy of the atoms

This is because atomic masses are the weighted average of the masses of all naturally occurring isotopes.

300s
112.35.c.6.c
• Q2

The atomic number of an element is defined by its number of __________

nuclei

electrons

neutrons

protons

300s
112.35.c.6.c
• Q3

the sum of the protons and neutrons in a nucleus is ___________________

element number

atomic number

mass number

300s
112.35.c.6.c
• Q4

which of the following is true for any atom?

mass number = number of protons = number of neutrons

atomic number = number of protons=number electrons

mass number - number of protons = number of electrons

atomic number = number of neutrons = number of electrons

300s
112.35.c.6.c
• Q5

how is the atomic mass unit (amu) defined?

1/12 the mass of a carbon - 12 atom

1/13 the mass of a carbon - 13 atom

1/14 the mass of a nitrogen - 14 atom

1/16 the mass of a oxygen - 16 atom

300s
112.35.c.6.c

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