Each year the southern California area has about <span>10,000 earthquakes... couldn't find the second part answer for the question but hoipe this helps
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The two are potassium and rubidium. Why? Na is an alkali metal. As you go down the metals become more reactive.
Calcium has 20 protons. Why? The atomic # is 20 (the one at the top).
It has 20 neutrons. Why? The atomic mass (the number on the bottom) is ~40, ignoring electron mass. 40- 20 protons = 20 neutrons.
It has 20 electrons.
Why? The # of protons and electrons is the same. Ions aren't on the periodic table.
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<h3>C.Green only</h3>
At low light levels, green leaves are most efficient at photosynthesis. But well yeah, in sunny days, red light will work the same as green light
Answer:
22
Explanation:
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