Question

eleven an energy level? eren 15) Why does it take more energy to remove an electron from Althan from Al? 16) Distinguish between an atom in its ground state and an excited atom. 17) Which of the following notations shows the electron configuration of a neutral atom in an excited state? Name the element, and explain how you know if it is excited or not: 1s 2s 2p' (b) 1s 2s 2p 3s! Oxygen is in excited States oxygen crtom exists in excited arccte. Actual oxygen Clectronic.configuration is 2s 2p! (ex 1s 2s 2p 3s 3p! 18) Isoelectronic species have similar electron configurations. Which of the following series of ions are isoelectronic? (a) Li, H. He (b) Ca? Ne, S. DL1-2

Answer 1

Question 15  ionisation energy is directly proportional to Z_effe​​​​​​

Now in Al ⁺ have 12 e and 13 protons in it where Al have 13 e and 13 proton

So due to less electron/ proton ratio in Al + it will have more

Z_effe resulting into high ionisation energy

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