The table below shows the 1st ionisation energies, H i1 , in kJ mol 1, of the

The table below shows the 1st ionisation energies, ΔH_i1, in kJ mol^–1, of the elements in Period 3 of the Periodic Table.

a. Explain why there is a general increase in the value of ΔH_i1 across the period.

b. Explain why aluminium has a lower value of ΔHi1 than magnesium.

c. Write the electronic configuration for argon (Z = 18) using 1s² notation.

d. Copy and complete the diagram below for the 15 electrons in phosphorus by
i. Adding labels for the other subshells.
ii. Showing how the electrons are arranged..

e. Predict a value for the 1st ionisation energy for potassium, which has one more proton than argon.

Transcribed Image Text:

Mg Al Si Ar Element Na AHL 736 577 786 1060 1000 1260 1520 494 P.