Among the results of geographical openness in Islamic countries:

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Islam spread successfully among groups historically located in agriculturally poor regions featuring few pockets of fertile land and in countries characterized by unequal land endowments. It was in these areas that the Islamic institutional arrangement proved appealing to the indigenous populations.

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.