Why two helium atoms do not combine to form He2? from Chemistr

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Chemical Bonding and Molecular Structure

Short Answer Type

1. What are valence electrons?

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2.

Why do atoms combine?

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3.

Can ionic bond be formed between similar atoms?

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4.
Why two helium atoms do not combine to form He₂?

(i) Each helium atom has a fully filled orbital whereas only half filled atomic orbitals combine to form a bond.

(ii) When two helium atoms approach each other, new forces of repulsion are greater than the forces of attraction.

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5.

What are 'Lewis structures'?

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6.

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

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7.

What is crystal lattice?

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8.

What is electrovalency?

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9.

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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