Chem 1 Exam 1 1.6-2.3
what is Dimensional Analysis
units of quantities must be subjected to the same math rules as other numbers
how do you set up eqashion to convert in to cm
in × cm/in =cm
a Nucleus has what change?
+
a Proton has what change?
heavy +
a Neutron has what change?
No charge
A Electron has what change and characteristics?
Orbit around nucleus, - charge
definition mass of element
is its mass number IE total number of protons in and neutron
why is atomic mass not perfect
it is an averge between 2 isotopes
where is the Mass number
bottom
where do you see charge of atom
top right
where atomic number
top left
how do you symbolis a isotopes
place mass number as superscript in top left of element symbol "Mg
why are Isotopes different
they have different nubers of neutrons.