The 1st ionisation energies of several elements with consecutive atomic numbers are shown in the graph below. The letters are not the symbols of the elements.

a. Which of the elements A to I belong to Group 1 in the Periodic Table? Explain your answer.

b. Which of the elements A to I could have the electronic configuration 1s² 2s² 2p⁶ 3s²?

c. Explain the rise in 1st ionisation energy between element E and element G.

d. Estimate the 1st ionisation energy of element J.

e. The successive ionisation energies of element a are shown in the sketch graph.

What information does this graph give about how the electrons are arranged in shells for element A?

Transcribed Image Text:

2000 1600 1200 1800 400 ABCDEF GHIJ Element First ionisation energy/kl mol