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Compare the size of the nucleus of calcium with that of potassium.

Explanation:

Atomic radius increases as you move down a group and to the left across a period.

Calcium has a more dense nucleus than that of potassium because it has more protons in its nucleus.  The positive charge from the protons pulls the electron cloud around it closer in, making for a smaller atomic radius.

Because potassium has less protons, the atomic radius is larger.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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