The middle of an atom, called the nucleus, has a _________ electrical charge, while the particles that circle the outside of the nucleus have a ____________ charge.

a. Positive, neutralb. Neutral, positivec. Negative, positived. Positive, negative

Warm up

Identifying the Atom

So…..atoms are made up of negative protons, neutral neutrons, and positive circling electrons…. right?

Wrong!!

Every same type of atom has the same # of______________________

Ex. On P.O.E.

Atomic #- is the number of protons an atom has!

Atomic #

Vocab: Atomic mass= is equal to its # neutrons plus #

protons.

Can’t measure with scale so unit is not grams but in amu

The mass of this oxygen atom is….? 16! Because

8 protons +8 neutrons=16 Weight of protons=weight of neutrons

Mass of those tiny atoms

Atomic mass= p+n

Algebraic formula

The electron is so small it is not even counted as part of its atomic mass/mass number!

The wimpy electron

The atom found most frequently in nature A neutral atom has the same number of

electrons as protons

So what is this_________>

The common type of atom

Vocab: Ion= Is any atom that has a different

number of electrons than protons.

If you take away an electron from an atom It becomes positively charged.

If you add an electron to an atom it becomes negatively charged.

Types of atoms

See ….watch this

Now a positive ion Now a negative ion

+ -

And so……if hydrogen has an atomic

number of 1, it must have 1 proton. But what if it has 2 neutrons?

Then it is called an isotope!

Atoms, ions, and isotopes Oh my!

Vocab: Isotope: An atom/element with a different

number of neutrons than protons

Okay…what if the number of p+ and neutrons are the same, but we have a different number of electrons. Then the atom is called an ……

ION

Types of atoms

plate#

# of particles

# of protons

#of neutrons

# of electrons

Atomic #

Atomic mass

Isotope,Ion,Neutral?

Name of Atom

1

2

3

4

5

6

7

Rock=proton, Lima bean=neutron, black bean=electron

1. What two numbers do you see that are always the same? 

2. Can an atom be both an ion and an isotope?3. What do you think would happen if a

common atom lost 3 electrons?4. _________+____________=atomic mass5. What is the smallest sub atomic particle in

the atom?6. What is a limitation to using this type of

model?

Answer these questions on the back!

Every same type of atom has the same # of______________________

Ex. On P.O.E.

Atomic #- is the number of protons an atom has!

Atomic #

Atomic mass= p+n

Algebraic formula

See ….watch this

Now a positive ion Now a negative ion

+ -

Vocab: Isotope: An atom/element with a different

number of neutrons than protons

Okay…what if the number of p+ and neutrons are the same, but we have a different number of electrons. Then the atom is called an ……

ION

Types of atoms

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