7. In the same shell, which of the following atomic orbital has the lowest energy? (a) 4d (b) 4p (c) 4s (d) 4f 8. Which of the following electron configurations is most stable? (a) 1s²2s² (b) ls²2s²2p³ (c) 1s²2s²2p° (d) 1s 2s 2p°3s² 9. Current periodic table arranges elements in order of (a) atomic number (b) mass number (c) density (d) atomic mass

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