Answer:
109 different types
Explanation:
There are more than 109 different types of atom - one for each element. Differences between the atoms give the elements their different chemical properties.
The scrotum functions to keep the testes at an optimum temperature
Answer:
have the same number of electron energy levels
Explanation:
All of the elements in the same period have the same number of atomic orbitals that are occupied by electrons that are in constant motion. For example the elements in the first period have one orbital for its electrons. The elements in the second period have two orbitals for their electrons. As you move down the table, every row adds an orbital. At this time, there is a maximum of seven electron orbitals.
Mutalistic Relationship <span />
<span>Rachel Carson National Wildlife Refuge,
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