CHEM 101

1.    Which of the following best describes atom? They are made up of ______.

• particles called protons, neutrons, and electrons

• particles called protons, nucleus, and electron

• 3 subatomic particles

• 4 subatomic particles

2. What refers to the positively charged subatomic particle?

• nucleus

• electron

• proton

• neutron

3. What refers to the negatively charged subatomic particle?

• nucleus

• electron

• proton

• neutron

4. Who suggested that all matter is made up of atoms, which were indivisible and indestructible?

• Dalton

• Thompson

• Rutherford

• Bohr

5. Who suggested that an atom consists of a small nucleus (positively charged) surrounded by negative electrons moving around the nucleus in orbits?

• Dalton

• Thompson

• Rutherford

• Bohr

6. Who assumed that an electron is two thousand times lighter than a proton and believed that an atom is made up of thousands of electrons?

• Dalton

• Thompson

• Rutherford

• Bohr

7. Who proposed the plum pudding model of atom?

• Dalton

• Thompson

• Rutherford

• Bohr

8. According to Rutherford, electrons revolve around the nucleus in fixed paths. What do you call these fixed paths?

• proton

• circular path

• nucleus

• orbit

9. Who proposed the modern theory of atom?

• Schrondinger

• Dalton

• Rutherford

• Bohr

10. Which refers to the arrangement of electrons in energy levels around an atomic nucleus?

• a. orbital diagram

• b. electron diagram

• c. electron configuration

• d. orbital configuration