Question

14. Mendeleev classified elements in
(a) increasing order of atomic groups
(b) eight periods and cight groups
(c) seven periods and nine groups
(d) eight periods and seven groups

15. Select the correct chronological order for the discoveries
of the following scientists.
Dobereiner, Newlands, Chancourtois, Mendeleev
(a) Chancourtois, Dobereiner, Newlands, Mendeleev
(b) Doberciner, Chancourtois, Newlands, Mendeleev
(c) Dobereiner, Newlands, Chancourtois, Mendeleev
(d) Chancourtois, Newlands, Dobereiner, Mendeleev

16. The molecular formula of chloride of Eka-Aluminium a
Eka-Silicon respectively are
(a) GaCl, and Sio (b) GaCl, and AICI,​

Answer 1

14. (c) seven periods and nine groups

15. (b) Döbereiner's, De-Chancourtois, Newlands, Meneleev

16.(b) GaCl, and AlCl

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Answer 2

Answer:

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Explanation:

14. seven periods and nine groups

15.GaCl, and Sio