Answer=3
The compound has an ionic bond.
<em><u>the answer is electrons </u></em>
Answer:
Decreases
Explanation:
The atmospheric pressure on the surface of the mercury pushes it up the evacuated tube until the downward pressure of the mercury equals the atmospheric pressure.
If the atmospheric pressure decreases, the mercury doesn't have to rise as high.
The mercury height decreases.
Answer:
helium is the smallest element and francium is the largest