i think metal because it feels hard
An atom (Protons, Neutrons, & Electons) is your basic building block. Add a few atoms together, and you get a molecule.Combine a few trillion molecules, and you get material.
Radios were made in the late 1800 they could send a wavelength but they really came along in the early 1900
The radio (a.k.a Marconi Wireless Telegraph) was invented by Guglielmo Marconi in Italy in the late 1800s.
Atoms