Matching
|
|
|
Match each item with the correct statement below. a. | proton | b. | nucleus | c. | atom | d. | electron | e. | neutron |
|
|
|
1.
|
the smallest particle of an element that retains the properties of that
element
|
|
|
2.
|
a positively charged subatomic particle
|
|
|
3.
|
a negatively charged subatomic particle
|
|
|
4.
|
a subatomic particle with no charge
|
|
|
5.
|
the central part of an atom, containing protons and neutrons
|
|
|
Match each item with the correct statement below. a. | mass number | b. | atomic mass unit | c. | atomic
number | d. | atomic mass | e. | isotope |
|
|
|
6.
|
atoms with the same number of protons, but different numbers of neutrons in the
nucleus of an atom
|
|
|
7.
|
the total number of protons and neutrons in the nucleus of an atom
|
|
|
8.
|
the number of protons in the nucleus of an element
|
|
|
9.
|
the weighted average of the masses of the isotopes of an element
|
|
|
10.
|
one-twelfth the mass of a carbon atom having six protons and six
neutrons
|
Multiple Choice
Read each question carefully and select the BEST
answer.
|
|
|
11.
|
Who was the man who lived from 460B.C.–370B.C. and was among the first to
suggest the idea of atoms?
a. | Atomos | c. | Democritus | b. | Dalton | d. | Thomson |
|
|
|
12.
|
Dalton's atomic theory included which idea?
a. | All atoms of all elements are the same size. | b. | Atoms of different
elements always combine in one-to-one ratios. | c. | Atoms of the same element are always
identical. | d. | Individual atoms can be seen with a microscope. |
|
|
|
13.
|
The comparison of the number of atoms in a copper coin the size of a penny with
the number of people on Earth is made to illustrate which of the following?
a. | that atoms are indivisible | b. | that atoms are very small | c. | that atoms are very
large | d. | that in a copper penny, there is one atom for every person on
Earth |
|
|
|
14.
|
Why did J. J. Thomson reason that electrons must be a part of the atoms of all
elements?
a. | Cathode rays are negatively-charged particles. | b. | Cathode rays can be
deflected by magnets. | c. | An electron is 2000 times lighter than a
hydrogen atom. | d. | Charge-to-mass ratio of electrons was the same, regardless of the gas
used. |
|
|
|
15.
|
Which of the following is correct concerning subatomic particles?
a. | The electron was discovered by Goldstein in 1886. | b. | The neutron was
discovered by Chadwick in 1932. | c. | The proton was discovered by Thomson in
1880. | d. | Cathode rays were found to be made of protons. |
|
|
|
16.
|
All atoms are ____.
a. | positively charged, with the number of protons exceeding the number of
electrons | b. | negatively charged, with the number of electrons exceeding the number of
protons | c. | neutral, with the number of protons equaling the number of
electrons | d. | neutral, with the number of protons equaling the number of electrons, which is equal
to the number of neutrons |
|
|
|
17.
|
The nucleus of an atom is ____.
a. | the central core and is composed of protons and neutrons | b. | positively charged
and has more protons than neutrons | c. | negatively charged and has a high
density | d. | negatively charged and has a low density |
|
|
|
18.
|
The atomic number of an element is the total number of which particles in the
nucleus?
a. | neutrons | c. | electrons | b. | protons | d. | protons and
electrons |
|
|
|
19.
|
How is the number of neutrons in the nucleus of an atom calculated?
a. | Add the number of electrons and protons together. | b. | Subtract the number
of electrons from the number of protons. | c. | Subtract the number of protons from the mass
number. | d. | Add the mass number to the number of electrons. |
|
|
|
20.
|
What unit is used to measure weighted average atomic mass?
a. | amu | c. | angstrom | b. | gram | d. | nanogram |
|