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Ions and Isotopes
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In uranium - 235 what does 235 represent?
mass number
How do you calculate mass number?
protons + neutrons
A charge of +2 means you have
 
more protons than electrons
 
more electrons than protons
 
more protons than neutrons
 
more electrons than neutrons
How many protons does Calcium have?
20
If Aluminum has a charge of +3, how many electrons are present?
10
If Arsenic has a charge of -3, then how many electrons does it have?
36
If Beryllium is electrically neutral, how many electrons does it have?
4
An atom with a + or - charge is called an
ion
What subatomic particle can NEVER change?
protons
For an atom to have an overall negative charge
 
electrons were gained
 
electrons were lost
Isotopes differ in the number of
 
neutrons
 
protons
 
electrons