What does the atoms nucleus contain?
Protons = + charge
Neutron = no charge
What is the electron's charge?
What is the nature of electrical charges for pro. neu. and elec?
Opposite charges attract each other
Like charges repel each other
Opposite charges cancel each other so that when a protin and an electron, when paired, are charge-neutral
Protons and electrons must have the same what to be charge-neutral?
# of protons must equal the # of electrons
Illustration of an element, Be
4=atomic # (Z)
Be= chem. Symbol
What is an element defined by?
Its # of PROTONS
Define the ion formula.
Ion charge = # of protons - # of electrons
T sor F. The # of protons has the same # of electrons.
element.illustration & proton,neutron,elec. info.