1. The noble gas electron configuration for each atom is:
- Na: [Ne] 3s¹
- Ca: [Ar] 4s²
- F: [He] 2s² 2p⁵
- O: [He] 2s² 2p⁴
- Cl: [Ne] 3s² 3p⁵
- Mg: [Ne] 3s²
- Al: [Ne] 3s² 3p¹
- S: [Ne] 3s² 3p⁴
2. An electron-dot diagram (Lewis dot structure) for each atom shows the element’s symbol surrounded by dots representing its valence electrons:
- Na: Na with one dot
- Ca: Ca with two dots
- F: F with seven dots (two on each of three sides, one on the fourth)
- O: O with six dots (two on each of three sides)
- Cl: Cl with seven dots (two on each of three sides, one on the fourth)
- Mg: Mg with two dots
- Al: Al with three dots
- S: S with six dots (two on each of three sides)
3. a. The sodium atom becomes more stable, but the chlorine atom becomes less stable.
b. Each atom ends up with a less-stable electron arrangement.
c. Each atom ends up with a more-stable electron arrangement.
d. The sodium atom becomes more stable, but the chlorine atom becomes less stable.
e. In the following sentence true or false? An ion is an atom that has a net positive or negative electric charge. True.
f. An ion with a negative charge is called an anion.
Parent Tip: Review the logic above to help your child master the concept of bonding and chemical formulas worksheet answers.
