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Question 1 of 3

1. Question

How do the elements of Group IIA form ions?

By gaining one electron
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By losing one electron
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By losing two electrons
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By gaining two electrons
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Question 2 of 3

2. Question

What does Mendeleev’s periodic law state? The properties of elements are the periodic function of their _________.

Atomic number
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Atomic masses
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Electron configuration
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Atomic radius
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Question 3 of 3

3. Question

Among the following reactions, which one shows a coordinate covalent bond formation?

N−+3H+⟶H3N\mathrm{N}^− + 3\mathrm{H}^+ \longrightarrow \mathrm{H}_3\mathrm{N}
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BF3+NH3⟶F3BN\mathrm{BF}_3 + \mathrm{NH}_3 \longrightarrow \mathrm{F}_3\mathrm{B} \mathrm{N}
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H++Cl−⟶HCl\mathrm{H}^+ + \mathrm{Cl}^- \longrightarrow \mathrm{HCl}
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H++H−⟶H2\mathrm{H}^+ + \mathrm{H}^− \longrightarrow \mathrm{H}_2
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