Use Mendeleev's Periodic Table to predict the formula of

(a) hydrides of carbon and silicon

(b) oxides of potassium, aluminium and barium.

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Solution

(a)C is in Group 4. So, the hydride will be CH₄ (Methane).
Si is in Group 4. So, the hydride will be SiH₄ (Silane).

(b)

K is in Group 1. So, the oxide will be K₂O (Potassium oxide).
Al is in Group 3. So, the oxide will be Al₂O₃ (Aluminium oxide).
Ba is in Group 2. So, the oxide will be BaO (Barium oxide).

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Similar questions

Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon

(b) Mention the period/periods of these elements in the modern periodic table.

(d) Classify these elements as metals, non-metals or metalloids.

(e) How many valence electrons are present in the atoms of each of these elements?

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