Combustion reactions usually follow the following reaction: fuel + water --> oxygen + carbon dioxide
True
The whole statement is true.
False
Some of the statement is false.

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

c. orbital shape i hope this is correct