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Periodicity

question 1 of 3 Grade: Form 3
question 1 of 3 Grade: Form 3

Q: Selenium, Se, is in the same Group of the Periodic Table as sulphur. What is the formula of sodium selenide?

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Did You Know?

From the graph, mass of CO₂ lost in 1 minute is 2.2g. Moles of CO₂ = 2.2/44 = 0.05 mol. CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O. Moles of CaCO₃ = 0.05 mol. Mass = 0.05 × 100 = 5.0g.

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Did You Know?

From the graph, mass of CO₂ lost in 1 minute is 2.2g. Moles of CO₂ = 2.2/44 = 0.05 mol. CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O. Moles of CaCO₃ = 0.05 mol. Mass = 0.05 × 100 = 5.0g.

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