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