Modern Day Atom
An atoms radius is 0.1nm
Atomic mass unit (amu)
Atoms are chemically neutral because the number of protons and electrons are equal
Arrangement of electrons e.g., 2,8,1
Elements are arranged in order by their atomic number
Proton - In nucleus, charge +1, mass of 1amu
Neutron - In nucleus, charge 0, mass of 1amu
Electrons - Energy Shells, charge -1, 1/1840 (almost zero)
An ion is a charged particle formed when an ion gains or loses electrons
A positively charged ion is formed when a metal or hydrogen atom loses electrons
A negatively charged ion is formed when electrons are added to a non-metal atom