Intext Questions III — task. Science CBSE, Class 10.

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1.Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements : K, C, Al, Si, Ba

2. Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?

Answer variants:

Be (atomic number

$4$ ) and Ca (atomic number

$20$ ) have similar electronic configuration, i.e. two electrons in outermost shells.

Yes, Dobereiner’s triads also existed in the cells of Newland’s Octaves.

$K_2O$ ,

$CO_2$ ,

$Al_2O_3$ ,

$SiO_2$ ,

$BaO$ .

Mendeleev used the relationship between the atomic force of the elements and their physical and chemical properties.

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3. Intext Questions III