An example would be gravity
Answer:
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İYİ DERSLER
Potassium is in the most reactive group of elements, the alkali metals, but it's not the most reactive metal within the group. The alkali metals, Group 1A, are the most reactive metals because they have one valence or outer electron. They lose this electron very easily, forming ions with a charge of +1.
Answer:
5 percent = normal matter
68 percent = dark energy
27 percent = dark matter
Explanation:
