Atomic Theory Review

Which part of the atomic theory did Niels Bohr prove?

• there are electrons

• there is a nucleus

• electrons are in energy levels

• gold foil experiment

Which part of the atomic theory did JJ Thomson prove?

• there are electrons

• electrons are in energy levels

• there is a nucleus

• cathode ray tube

What experiment did JJ Thomson use?

• gold foil experiment

• cathode ray tube experiment

John Dalton wrote postulates to make the idea of the atom useful. Which postulate below was proven wrong?

• All elements are made up of tiny indivisible particles called atoms.

• The atoms of one element are different from the atoms of another element.

• Atoms of different elements chemically combine to form chemical compounds.

• During chemical reactions, atoms are rearranged.

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JJ Thomson came up with which model for the atom?

• planetary model

• electron cloud model

• plum pudding model

• nuclear model

The number of protons is equal to the number of electrons for an atom. This means an atom is-

• electrically neutral

• electrically positive

• electrically negative

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What determines chemical reactivity?

• protons

• neutrons

• electrons

• isotopes

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What determines the identity of the atom?

• protons

• neutrons

• electrons

• isotopes

Which subatomic particle has a neutral charge?

• protons

• neutrons

• electrons

• isotope

After Rutherford discovered the nucleus, which model is believed to be true?

• protons, neutrons, and electrons are evenly distributed

• the nucleus is made of protons, neutrons, and electrons

• the nucleus is made of protons and electrons

• the model is mostly empty space with a central nucleus

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