The first ionisation energies of twenty successive elements in the Periodic Table are represented in the graph. The letters given are not the normal symbols for these elements. [Figure of first ionisation energy graph] Which statements about this graph are correct? 1 Elements B, J and R are in Group 18 of the Periodic Table. 2 Atoms of elements D and L contain two electrons in their outer shells. 3 Atoms of elements G and O contain a half-filled p subshell.
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✓ Correct answer
A: 1, 2 and 3 are correct
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