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Electron charge

Explanation:

In atoms, Bohr model looked like a small, charged nucleus surrounded by neutrons. It is most likely going to make sense with electron charge since it said "Charged."

islam spread slowly through much of africa through trade and preaching.

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

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