Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

Question

BlackTom AI · Accepted Answer

To determine the increasing order of first ionisation energy (IE1) for Al, Si, and C, we examine the general trends and the known values for these elements. 
Option a: Al, C, Si — This would place aluminum (low IE1) first, followed by carbon, then silicon. However, silicon’s IE1 is higher than aluminum but lower than carbon, so this sequence is incorrect since C should be after Si, not before Si.
Option b: Si, Al, C — Starting with silicon implies Si has the lowest IE1, which is false because aluminum has the lowest IE1 among these three elements. So this ordering is incorrect.
Option c: Al, Si, C — This sequence starts with aluminum, which has the smallest IE1, then silicon, then carbon, which has the highest IE1 among the three. This matches the known values: Al ≈ 5.99 eV, Si ≈ 8.15 eV, C ≈ 11.26 eV, giving an increasing trend Al < Si < C. Therefore this option is correct.
Option d: Si, C, Al — This places silicon before carbon and aluminum last, implying Al has the highest IE1, which is incorrect since aluminum’s IE1 is the lowest among the three.
Option e: C, Si, Al — This would place carbon first with the lowest IE1, which contradicts the actual data where carbon has the highest IE1 among these elements.
Option f: C, Al, Si — This order starts with carbon as the lowest IE1, which is incorrect because carbon has the highest IE1 in this group, not the lowest. 
In summary, only option c presents the correct increasing order Al < Si < C for first ionisation energies, aligning with the known ionisation energy values and periodic trends.

Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).单项选择题

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Select the response which presents the three elements below in order of increasing first ionisation potential (IE1).

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