1. What group tends to form 1+ ions? → Alkali metals (Group 1)
2. What group tends to form 2+ ions? → Alkaline earth metals (Group 2)
3. What group tends to form 3– ions? → Nitrogen group (Group 15)
4. What group tends to form 1– ions? → Halogens (Group 17)
5. What group tends to form 2– ions? → Chalcogens (Group 16)
6. Ions of the alkali metals, alkaline earth metals, halogens, noble gases, actinides, lanthanides, main group elements, nonmetals/semimetals, transition elements and inner transition elements tend to have what charge? → Charge equal to their group number (for metals) or 8 minus group number (for nonmetals), except noble gases (0) and transition/inner transition (variable).
7. Explain the trend for electronegativity across a period from left to right. → Electronegativity increases due to increasing nuclear charge and decreasing atomic radius.
8. Explain the trend for electronegativity down a group from top to bottom. → Electronegativity decreases due to increasing atomic radius and shielding effect.
9. Which element has the highest first ionization energy? → He
10. Which element has the lowest electronegativity? → Fr
11. Which element has the largest atomic radius? → Fr
12. Which element has the smallest atomic radius? → He
13. To define your answers: Ionization energy is the energy required to remove an electron; electronegativity is the ability to attract electrons in a bond; atomic radius is the distance from nucleus to valence shell.
14. Which element has the highest first ionization energy? → He
15. Which element has the highest electronegativity? → F
16. Which element has the most metallic character? → Fr
17. Which element has the largest size? → Fr
18. To define your answers: Same as above.
19. Which element has the highest first ionization energy? → Ne
20. Which element has the highest electronegativity? → F
21. Which element has the most metallic character? → Cs
22. Which element has the largest size? → Cs
23. Identify the largest and smallest atoms in each set:
a) F, Cl, Br, I → Largest: I, Smallest: F
b) Li, Be, B, C, N, O, F → Largest: Li, Smallest: F
c) Na, Mg, Al, Si, P, S, Cl → Largest: Na, Smallest: Cl
24. Write the formula with charges of the ions formed by each of these elements:
H → H⁺
Ca → Ca²⁺
Mg → Mg²⁺
K → K⁺
Al → Al³⁺
Cl → Cl⁻
O → O²⁻
N → N³⁻
S → S²⁻
P → P³⁻
25. Determine the formula(s) of the compound(s) formed from these combinations:
H & Cl → HCl
Mg & O → MgO
Al & Cl → AlCl₃
K & P → K₃P
Ca & N → Ca₃N₂
Ba & I → BaI₂
Parent Tip: Review the logic above to help your child master the concept of periodic table trends worksheet answers.
