aap exam 1 Questions and Answers
The maximum number of electrons that the first energy level can hold is ______.
2
Ionic bonds, such as in sodium chloride, ______.
are formed by the association of ions with the same charge
are bonds created by the gaining of electrons
are formed by the ...
The maximum number of electrons that the first energy level can hold is ______. -
answer 2
Ionic bonds, such as in sodium chloride, ______.
are formed by the association of ions with the same charge
are bonds created by the gaining of electrons
are formed by the association of ions with opposite charge
share electrons - answer are formed by the association of ions with opposite charge
Radioactive atoms have unstable __________. - answer nuclei
Atoms are the smallest stable units of __________. - answer matter
The smallest stable units of matter are - answer atoms
The "atomic number" of an atom is determined by the number of ________ it has. -
answer protons
One mole of any element
has the same number of atoms.
has the same number of electrons.
has the same weight.
has the same mass.
All of the answers are correct. - answer has the same number of atoms
The nucleus of an atom consists of
protons.
protons + neutrons.
protons + electrons.
neutrons.
electrons. - answer protons + neutrons
Isotopes of an element differ in the number of - answer neutrons
The mass number represents the number of
protons + neutrons.
neutrons in an atom.
neutrons + electrons.
protons in an atom.
electrons in an ion. - answer protons + neutrons.
, Radioisotopes have unstable - answer nuclei
Which element commonly has only a proton as its nucleus? - answer hydrogen
If an isotope of oxygen has 8 protons, 10 neutrons, and 8 electrons, its mass number is
- answer 18
A(n) ________ is a pure substance composed of atoms of only one kind. - answer
element
Which parts of atoms can interact (react) to form chemical bonds? - answer valence
electrons
Atoms of oxygen have a total of 8 electrons. Are these atoms stable, and why or why
not?
No, because the atoms have only 6 valence electrons, but need 8 for stability.
No, because only atoms with 2 valence electrons are stable.
Yes, because the Octet Rule says stable atoms have 8 electrons.
Yes, because oxygen is in the air we breathe and it doesn't hurt us. - answer No,
because the atoms have only 6 valence electrons, but need 8 for stability.
Carbon atoms have four valence electrons. Are they likely to react with other atoms,
and why or why not?
Yes, because they can become more stable by doing so.
No, because they do not have enough valence electrons.
Yes, but only with other stable atoms.
No, because they have an even number of valence electrons so they are already
stable. - answer Yes, because they can become more stable by doing so.
Which of the following is not produced through chemical bonding?
cells
atoms
the heart
adipose (fat) tissue - answer atoms
What is an ion?
an atom that loses all of its protons
an atom that has either gained or lost electron(s)
an atom that is sharing electrons with another atom
an atom that has lost one or more neutrons - answer an atom that has either gained
or lost electron(s)
When an ionic bond forms, which part(s) of the atoms are directly involved?
both the protons and the electrons
the neutrons
the protons
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