Which model of the atom first introduced the idea of a nucleus?

question options:

thomson's model

dalton's model

rutherford's model

bohr's model

May someone explain how to do this question?

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To run the physics cart, the fan speed of the cart is manipulated. this is the (blank) variable. the cart accelerates due to the speed of the fan. acceleration is therefore the (blank) variable. a “constant” is a parameter that stays the same regardless of the variables. one parameter of the cart that is held constant is the (blank) .