Atomic number,

electron number, mass

number, and isotopes

are positively charged (+1)

Atoms of the same element will have:

- the same number of protons

- the same number of electrons as protons atomic number

are negatively charged (-1)

Atoms have no overall charge; they are neutral.

mass number = +

Atoms can have different numbers of neutrons.

Proton Neutron Electron

Charge +1 0 -1

Mass 1 1 0.0005

The Periodic Table

+

or

6 + X = 12

X = 12 – 6 = 6 neutrons

The Periodic Table

3 protons

3 electrons

3 + X = 7 X = 7 - 3

X = 4

4 neutrons

13 protons

13 electrons

13 + X = 27 X = 27 - 13

X = 14

14 neutrons

13 protons

13 electrons

13 + X = 26 X = 26 - 13

X = 13

13 neutrons

isotopes

The Periodic Table

13 protons

13 electrons

13 + X = 27 X = 27 - 13

X = 14

14 neutrons

13 protons

13 electrons

13 + X = 26 X = 26 - 13

X = 13

13 neutrons

Review

The atomic number (proton number) defines atoms.

Atoms are neutral

• Same number of protons and electrons

The mass number = #protons + #neutrons

• Neutron number can vary without changing atom type

• Atoms with different neutron numbers (mass numbers)

are called isotopes

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