Ionization energy, electronegativity and reactivity trends

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Ionization energy falls from 5.392 eV for lithium to 3.894 eV for cesium (PubChem). By what percent does it drop, to 0.01%, Ari?

   27.78 %
2. 2.

   Electronegativity falls from 3.98 for fluorine to 2.66 for iodine (Pauling). By what percent does it drop, to 0.01%, Bo?

   33.17 %
3. 3.

   Ionization energy falls from 5.139 eV for sodium to 4.341 eV for potassium (PubChem). By what percent does it drop, to 0.01%, Esme?

   15.53 %
4. 4.

   Which has the higher electronegativity, sodium or sulfur, Jun?

   • Sodium
   • Sulfur
   • They are equal
5. 5.

   Which is more electronegative, chlorine or bromine, Kira?

   • They are equal
   • Chlorine
   • Bromine
6. 6.

   Which has the lower first ionization energy, potassium or magnesium, Luz?

   • They are equal
   • Potassium
   • Magnesium
7. 7.

   Milo says cesium's outer electron is harder to remove than lithium's because cesium is bigger. Agree or disagree?

   • Agree: big atoms hold on tighter
   • Agree: more shells mean more grip
   • Disagree: farther out, easier to remove
8. 8.

   Pia says electronegativity is measured in joules. Agree or disagree?

   • Agree: it is an energy
   • Disagree: it has no units
   • Agree: like ionization energy
9. 9.

   Neon's first ionization energy is 21.565 eV (PubChem). What does that show, Ren?

   • It is a reactive metal
   • Its full shell holds tightly
   • It loses electrons easily
10. 10.

    In period 3, which has the higher first ionization energy, chlorine or argon, Zee?

    • Argon
    • Chlorine
    • They are equal