Respuesta :

Answer:

radical

Explanation:

A radical is group of atoms. Some common examples of radicals are the OH- (hydroxide ion), NO₃⁻ (nitrate ion) and more.  

Cu + 2HNO₃ →Cu(NO₃)₂  + H₂

In this single replacement reaction, the nitrate ion (NO₃⁻) which is the radical is replaced from nitric acid to form copper nitrate.