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Atomic Structure
Test Description: Review of atomic structure!
Instructions: Answer all questions to get your test result.
1) The 3 basic components of an atom are:
A
protons, neutrinos, and ions
B
protons, neutrons, and electrons
C
protons, neutrons, and ions
D
quarks, neutrons, and electrons
2) An element is determined by the number of
A
neutrons
B
protons
C
electrons
D
atoms
3) The nucleus of an atom consists of
A
protons and neutrons
B
neutrons
C
protons and electrons
D
electrons
4) A single proton has what electrical charge?
A
no charge
B
negative charge
C
either a positive or negative charge
D
positive charge
5) Which particles have approximately the same size and mass as each other?
A
none - they are all very different in size and mass
B
electrons and protons
C
neutrons and electrons
D
protons and neutrons
6) Which two particles would be attracted to each other?
A
protons and electrons
B
electrons and neutrons
C
all particles are attracted to each other
D
protons and neutrons
7) The atomic number of an atom is ALWAYS equal to:
A
the number of protons plus neutrons
B
the number of neutrons
C
the number of electrons
D
the number of protons
8) Changing the number of neutrons in an atom causes it to be a(n):
A
charge
B
element
C
isotope
D
ion
9) When you change the number of electrons in an atom, you produce a different:
A
atomic mass
B
ion
C
isotope
D
element
10) According to atomic theory, electrons are usually found:
A
outside the nucleus, in orbit around it
B
Two answers above are correct.
C
in the atomic nucleus
D
outside the nucleus in energy levels, also known as the electron cloud
11) An ion with a -1 charge
A
has lost a proton.
B
has gained a neutron.
C
has gained an electron.
D
has lost an electron.
12) Mass number
A
is the number of protons plus electrons.
B
is the number of protons plus neutrons.
C
is the number of protons only.
D
is the number of electrons plus neutrons.
13) Which of the following is true of oxygen with 8 protons, 8 neutrons, and 8 electrons?
A
It has atomic number of 16.
B
It has an atomic number of 8.
C
It has a charge of +8.
D
It has a mass number of 8.
14) Positive ions are called _____________ and they are formed by _____________ electrons.
A
cations, gaining
B
anions, losing
C
cations, losing
D
anions, gaining
15) Anions are _____________ ions and they are formed when an atom __________ electrons.
A
positive, gains
B
negative, gains
C
negative, loses
D
positive, loses
16) The atomic number of Lithium is__________.
A
7
B
None of these
C
3
D
6.9
17) The number of neutrons in an atom is
A
the same as the mass number.
B
equal to the number of protons and electrons.
C
the same as the atomic number.
D
equal to the mass number minus the number of protons.
18) An isotope of Nitrogen-20 has __________ protons and ___________ neutrons.
A
13, 7
B
7, 20
C
7, 13
D
7, 7
19) How many electrons are in a H+ ion?
A
None of these.
B
0
C
2
D
1
*select an answer for all questions
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