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Chemical Bonding and Molecular Structure

Short Answer Type

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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5.
What are 'Lewis structures'?

Lewis Structures are visual representations of the bonds between atoms and illustrate the lone pairs of electrons in molecules. It represents the valence electrons of an atom by dots or crosses around the symbol of the atom is called Lewis structure. For example valence electron of carbon is 4 thus, Lewis structure is,