Define: (1) Radioactivity (2) Halogens (3) Allotropy | web4study

Define: (1) Radioactivity (2) Halogens (3) Allotropy



(1) Radioactivity:

It is the spontaneous disintegration of the nucleus of an atom, in which invisible radiation is emitted, which affect a photographic plate.

 

(2) Halogens:

These are an element of VII A group of the periodic table. They combine readily with metals to form salts.

 

(3) Allotropy:

Allotropy is the phenomenon in which the same chemical substance exists in different physical forms with different physical properties but chemically they are same. Eg. Sulpher, Carbon

 

 


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