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Which is the negatively charged particle located outside the nucleus of an atom?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
An atom of fluorine has nine electrons. Its second energy level has _________ electrons.
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
How many different kinds of atoms does an element contain?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
One isotope of carbon differs from another in which way?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
What principle can be applied to all chemical reactions?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
In the periodic table of the elements, elements in Group 1 have how many outer electrons?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
If an atom has 7 electrons, how many are located in the second energy level?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
Which is the best description of activation energy?
5
electron
seven
Heat added to initiate a reaction.
1
one
conservation of mass
number of neutrons
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