Who was the first person to think about an atom’s existence?

• Ernest Rutherford

• John Dalton

• Democritus

• Niels Bohr

According to Dalton's theory, atoms of the same element are:

• Different

• Identical

• Divisible

• Invisible

Who discovered the electron?

• James Chadwick

• Ernest Rutherford

• J.J. Thomson

• John Dalton

What did J.J. Thomson's model of the atom resemble?

• Chocolate Cake

• Vanilla Pudding

• Plum Pudding

• Apple Pie

Who used the gold foil experiment to discover the nucleus?

• J.J. Thomson

• Democritus

• Ernest Rutherford

• Niels Bohr

Who described the atom as negative particles traveling in orbits around a positive nucleus?

• John Dalton

• Democritus

• Ernest Rutherford

• Niels Bohr

Where are protons located in an atom?

• In the energy levels

• In the neutron

• In the nucleus

• In the electron cloud

What makes an atom neutral?

• Having the same number of electrons and protons

• Having more protons than electrons

• Having no protons or electrons

• Having more electrons than protons

What did Ernest Rutherford conclude from the gold foil experiment?

• The atom has a negative charge

• The atom is a positive sphere with electrons shoved into the sides

• The atom is solid and indivisible

• The atom is mostly empty space

What is the charge of an electron?

• -1

• 1

• 0

• 1/1840