Final Answer:
1. Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)
2. They are all in the last column (Group 18) of the periodic table.
3. Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr)
4. They are all in the first column (Group 1) of the periodic table.
5. The number of valence electrons increases by 1 as you move left to right across a row.
6. The number of energy levels (shells) increases as you move down a group.
7.
- Alkali Metals: Lithium (Li) & Sodium (Na)
- Alkaline Earth Metals: Magnesium (Mg) & Calcium (Ca)
- Boron Family: Aluminum (Al) & Gallium (Ga)
- Carbon Family: Silicon (Si) & Germanium (Ge)
- Nitrogen Family: Phosphorus (P) & Arsenic (As)
- Oxygen Family: Sulfur (S) & Selenium (Se)
- Halides: Chlorine (Cl) & Bromine (Br)
- Noble Gases: Argon (Ar), Krypton (Kr), & Xenon (Xe)
8. Elements in each family are in the same vertical column (group).
9. Hydrogen is sometimes placed with alkali metals because it has 1 valence electron, but it’s not a metal and doesn’t behave exactly like them.
10. Barium = 2, Lead = 4, Xenon = 8, Potassium = 1
Parent Tip: Review the logic above to help your child master the concept of periodic table basics worksheet answer key.
