THE ATOM

Which of the following experiments led to the discovery that atoms have a dense, positively charged nucleus?

• Cathode ray tube experiment by J.J. Thomson

• Oil drop experiment by Robert Millikan

• Gold foil experiment by Ernest Rutherford

• Quantum mechanical model by Erwin Schrödinger

The scientist that is usually associated with discovery of electron in the atom is…

• Democritus

• Dalton

• Thomson

• Rutherford

What type of charge does a proton have?

• Positive

• Negative

• Neutral

• No charge

What type of charge does a neutron have?

• Positive

• Negative

• Neutral

• No charge

What type of charge does a electron have?

• Positive

• Negative

• Neutral

• No charge

What are the two primary particles found in the nucleus of an atom?

• Proton and Electron

• Electron and Photon

• Neutron and Proton

• Proton and Positron

Which of the following statements is correct about the element written as shown in the picture. ?

• The number of neutrons in the nucleus is 6

• The total number of neutrons and protons is 13

• The total number of electrons and protons is 19

• The number of electrons is 7

Which ion that has lost 2 electrons below?

• K⁺

• O²⁺

• C^3-

• N^-

What is the correct statement below for this symbol: Ca²⁺.

• Calcium forms ions by gaining 2 electrons

• Calcium forms ions by losing 2 electrons

• Calcium forms isotopes by gaining 3 electrons

• Calcium forms isotopes by losing 2 electrons

The correct statement about this symbol 11H , 12H, 13H is…

• Ions, with different number of electrons

• Ions, with different number of protons

• Isotopes, with different number of neutrons

• Isotopes, with different number of protons