Naming Cations and Anions

Presentation

•

Chemistry

•

10th Grade

•

Hard

Joseph Anderson

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10 Slides • 2 Questions

Cations and Anions

Cations

Some atoms will lose electrons to achieve a stable electron configuration. A positive ion is formed to have an electron configuration similar to that of the nearest noble gas.

If the last energy level 1, 2 or 3, we must lose an electron

The last level must be complete

Na=1s² 2s² 2p⁶ 3s¹

Example

Sodium atom

Sodium ion (Na⁺)

+=1+

An ion with a positive charge is called a cation.

Multiple Choice

A potassium atom (K)

1s2 2s2 2p6 3s2 3p6 4s1

A potassium atom (K) loses 1 electron potassium ion (K+).

A potassium atom (K) loses 3 electron potassium ion (K3+).

A potassium atom (K) gain 1 electron potassium ion (K-).

A potassium atom (K) gain 2 electron potassium ion (K2-).

 Anions

Some atoms will gain electrons to achieve a stable electron configuration. The negative ion that is formed also has an electron configuration similar to that of the nearest noble gas.

If the last energy level 5, 6 or 7, we must gina an electron

Fluorine atom

(F)=1s² 2s² 2p⁵

Example

fluoride ion (F⁻)

An ion with a negative charge is called an anion.

-=1-

Multiple Choice

A nitrogen atom (N)

1s2 2s2 2p3

A nitrogen atom (N) loses 3 electrons (N3+).

A nitrogen atom (N) gains 3 electrons (N3−).

A nitrogen atom (N) gains 3 electrons (N3+).

A nitrogen atom (N) gains 4 electrons (N4−).

done by: Ali and Salem

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Cations and Anions

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