Troposphere, the first layer...
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Brainliest?
Answer:
the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).
The oxygen atom has 4 valence electrons. Valence electrons are the electrons found in the outermost shell of an atom. These are the electrons that participate in chemical reactions during bonding. Since 4 electrons make up 2 pairs, an oxygen atom is capable of making <em>2 covalent bonds</em>.
