What is a Free Radical?

Topic: 

Free Radical

Definition:

Atoms or molecules with a free (spare) electron are called free radicals.

Explanation: 

Uncharged molecule highly reactive and 

short-lived having an unpaired valence electron.

An unpaired electron is a single electron, alone in one orbital. Free radicals are unique and rare species, molecular oxygen is a typical free radical

Many radicals are unstable and highly reactive.

Assessment:

1.    Free radicals are electrically

A.   positively charged

B.   negatively charged

C.   neutral

D.   all of above

2.    Ca on losing 2 electrons becomes

A.   Ca-2

B.   Ca-1

C.   Ca+2

D.   Ca-2

3.    The smallest part of an element that cannot exist as a free state is

A.   ion

B.   charge

C.   atom

D.   molecule

 

4.    A free radical has

A.   unpaired electrons

B.   paired electrons

C.   no electrons

D.   even number of electrons

5.    An oxide ion has -2 charge because

A.   oxygen looses two electrons

B.   oxygen gains two electrons

C.   oxygen becomes neutral

D.   oxygen gains 3 electrons

Answers: 

1. C

2. C

3. C

4. A

5. B

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