Question

1. the number of protons in an atom equals the atomic number. 6. the vertical columns in the periodic table are called groups. 7. a neutral atom of oxygen has 8 protons and 8 electrons. 8. chlorine and bromine belong to the halogen family. match the family with the correct description: a. alkali metals b. halogens c. noble gases d. alkaline earth metals 9. very stable, do not react easily: c 10. found in group 1, very reactive: a 11. found in group 17, form salts with metals: b 12. found in group 2, fairly reactive: d

Explanation:

• 5. The number of protons in an atom equals the atomic number.
• 6. Vertical columns in the periodic table are called groups or families.
• 7. A neutral atom of oxygen has 8 protons and 8 electrons.
• 8. Chlorine and bromine belong to the halogens family.
• 9. Noble gases are very stable and do not react easily.
• 10. Alkali metals are found in Group 1 and are very reactive.
• 11. Halogens in Group 17 form salts with metals.
• 12. Alkaline - earth metals are found in Group 2 and are fairly reactive.

Answer:

1. Atomic number
2. Groups or families
3. 8 protons and 8 electrons
4. B. Halogens
5. C. Noble gases
6. A. Alkali metals
7. B. Halogens
8. D. Alkaline earth