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?

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

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

   • Potassium
   • Magnesium
   • They are equal
6. 6.

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

   • Agree: it rises across too
   • Disagree: it falls down the group
   • Agree: heavier atoms need more energy
7. 7.

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

   • Disagree: it has no units
   • Agree: like ionization energy
   • Agree: it is an energy
8. 8.

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

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

    • They are equal
    • Argon
    • Chlorine