Reading the Periodic Table

Question 1

What is the difference btw stoichiometric coefficients and subscript number?

Answer 1

stoichiometric coefficient is the big number in front of a reactant - shows number of molecules in reaction

sub-script - # of atoms of that element in the molecule

Question 2

What is a period and what does it mean?

Answer 2

period is a row

period # of an element = # of energy levels in an atom of that element

Question 3

What are groups and what do they mean?

Answer 3

groups are columns

last group digit = # of valence electrons