What element has the smallest size in the third period of periodic table

The smallest element in the third period is Argon. This is due to the large attraction between the positively charged protons in the nucleus and the negatively charged electrons in the cloud. The attraction pulls the electrons inward and decreases the radius by condensing the electron cloud.

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The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !