How many neutrons does an element have if its atomic number is 46 and its mass number is 160

Which leader was the first african american president at two different institutions for higher learning

The principle that the geoglical processes that we see today have occurred through out earths history is called

What were the anti-federalists against? a. the views of patrick henry b. ratification of the constitution without a bill of rights c. the declaration of independence from great britain d. a weak central government