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1. What are valence electrons?

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Why do atoms combine?

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Can ionic bond be formed between similar atoms?

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Why two helium atoms do not combine to form He₂?

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What are 'Lewis structures'?

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Name the conditions for the formation of an ionic bond between two atoms.

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What is crystal lattice?

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What is electrovalency?

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What bond is present in MgCl₂ molecules?

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10. Write Lewis dot symbols for atoms of the elements Mg, Na, B, O, N, Br.

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