1. What does an atom looks like? What are the sub-atomic particles inside it.....(talk about electrons, neutrons, protons, electron shells, nucleus..

An atom look like this :


















Picture adapt from :
http://www.clker.com/cliparts/3/8/9/1/1195436863389690204logomancer_Atom_Model.svg.med.png

The sub-atomic particles inside it is protons ,neutrons and electrons.
Protons and neutrons are found inside nucleus. Electrons are found on
electron shell. Protons and electrons have the same number. While neutrons
have different number with protons and electrons. Protons are positive charges,
electrons are negative charges and neutrons have zero charges.