Question

1. what is the atomic number of oxygen? 2. which element is in group 1, period 3? 3. what is the symbol for calcium? 4. which group contains the noble gases? 5. which element has 17 protons? 6. is aluminum (al) a metal, nonmetal, or metalloid? 7. name an element that is a liquid at room temperature. 8. which element is more reactive: sodium (na) or lithium (li)? 9. what element has the highest atomic number in period 2? 10. which group contains the most reactive metals?

Explanation:

1.

Step1: Recall atomic number concept

The atomic number of an element is equal to the number of protons. Oxygen has an atomic number of 8.

Step1: Locate element in periodic table

The element in Group 1, Period 3 is sodium. Its symbol is Na.

Step1: Know calcium symbol

The symbol for calcium is Ca.

Answer:

8
2.