What happens if we don’t have the same number of p+ and e-?

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Presentation transcript:

What happens if we don’t have the same number of p+ and e-? Then we no longer have a neutral atom. Neutral atoms have NO CHARGE

What happens if we don’t have the same number of p+ and e-? They have the same number of positive particles as negative particles. (these cancel each other out!) Example: Oxygen has an atomic number of 8. An atom of oxygen has 8p+ and 8e- So… +8 + -8 = 0

What happens if we don’t have the same number of p+ and e-? In order for an atom to not be neutral, the number of e- changes, the numbers of p+ and n0 remain the same. We call this an ION Ion- an atom with either a positive or negative charge, a charged particle.

Example: Oxygen commonly has a -2 charge. Oxygen always has 8 p+ (atomic number) +8 + -x = -2 X = 10 This means there are 10 electrons in an ion of oxygen. Symbol= O2- or O-2

Example: Boron commonly has a +3 charge. Boron always has 5 p+ (atomic number) +5 + -x = +3 X = 2 This means there are 2 electrons in an ion of boron. Symbol: B3+ or B+3

Example If an atom has 7 protons and 10 electrons, what is its charge? -3

Terms Negative ions are called ANIONS Means you gain electrons Positive ions are called CATIONS. Means you lose electrons

Homework Part 7 Pick up bingo sheet and review Number 3: use ISOTOPE NOTATION (see part 6 for example) Number 4: Be careful; these are ions, so #p+ doesn’t equal # e-! If the charge is -, there should be more e- than p+! Number 5: Answers should look like those in number 4 Pick up bingo sheet and review Bingo sheet must be filled in for tomorrow! Review and definitions for bingo due WEDNESDAY