2 examples of when scientists used space probe technology to find out more about comets.

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

One or more substances changing into one or more substances is an example of a

What are the charges of the subatomic particles by choosing the answer from the drop down menu. protons have a (+1,0,or-1). (protons,neutrons,electrons) have a 0 charge. 3.) electrons have a (+1,0,-1)