Consider the two electron arrangements for neutral atoms A and B. Are atoms A and B the same element?

A - 1s2, 2s2, 2p6, 3s1

B - 1s2, 2s2, 2p6, 5s1

yes or no

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Referring back to question 6 above, in the TLC plate on the left the mobile solvent phase was ethyl acetate, in the plate on the right it was 97% ethyl acetate and 3% methanol.

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