CHEM 101

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

2. What refers to the positively charged subatomic particle?

3. What refers to the negatively charged subatomic particle?

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

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

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?

7. Who proposed the plum pudding model of atom?

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

9. Who proposed the modern theory of atom?

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