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?

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

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

   • Agree: more shells mean more grip
   • Disagree: farther out, easier to remove
   • Agree: big atoms hold on tighter
7. 7.

   Noah says ionization energy rises going down group 1. Agree or disagree?

   • Disagree: it falls down the group
   • Agree: it rises across too
   • Agree: heavier atoms need more energy
8. 8.

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

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

   Why does PubChem list no Pauling electronegativity for neon, Tala?

   • It is too heavy
   • It has no electrons
   • It doesn't form ordinary bonds
10. 10.

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

    • Chlorine
    • Argon
    • They are equal