Ions & Valency

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5 Terms

1
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Define valency

Valency is the combining capacity of an element, how many electrons it needs to lose, gain, or share for a full outer shell

2
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What is the valency of an element in Group 7

Elements in Group 7 have 7 valence electrons, so they need 1 more to be stable. Their valency is 1

3
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State the octet rule

Atoms tend to gain, lose, or share electrons until they have a full outer shell of eight electrons, which makes them highly stable

4
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Define cation

A cation is a positively charged ion formed when an atom loses electrons

5
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Define anion

An anion is a negatively charged ion formed when an atom gains electrons