atoms, elements and compounds

Cards (15)

what are all substances made from
atoms
what is an atom
the smallest part of an element that can exist
what is the radius of an atom
0.1 nm (nanometers) (1 x 10-10m), is very small
what is the radius of the nucleus
1 x 10-14 m (1/10000th of the radius of an atom)
where is most of the mass in an atom located
in the nucleus
what can elements be represented as
symbols
how many elements are there
about 100
where are elements shown
periodic table
what is a compound 
two or more different atoms chemically joined together in fixed proportions
how can compounds be separated into their elements
by chemical reactions
are the properties of a compound the same as the elements they are made from
no
what is an element
a substance made up of only one type of atom
what is a molecule
two or more atoms joined together
where are the reactants found in an equation
left hand side
where are the products found in an equation
right hand side