Answer to Question #51136 in Inorganic Chemistry for vizzy
18 Which of these periods on the periodic table has only eight elements?
19 Which of these scientists attempted to classify elements into periods?
De Chancourtois and Dobereiner
Gibbs and Dobereiner
De Chancourtois and Le Chatiler
Graham and Dalton
20 The ionization energy of alkaline earth metals __________ on moving down the group.
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