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Published byHolden Gould
Modified over 2 years ago
Have 1 Periodic Table per group!
The mass number
Protons & neutrons
The Nuclear Model
The Plum Pudding Model
amu (atomic mass unit)
Plum Pudding Model
All matter is composed of atoms Atoms can’t be divided, created or destroyed Atoms of different elements combine in simple whole-number ratios to form compounds Atoms are identical in mass Atoms can be combined, separated or rearranged
Atoms of the same element can have different masses – isotopes Atoms are divisible – Nuclear chem. Atoms can be changed from one element to another- Nuclear chem.
Cathode Ray Tube
8 8 8 8
Consisted of a cloud of evenly distributed positive charge with the negative electrons embedded randomly in it.
one mole = molar mass
The Plum Pudding Model
56 Fe Fe26
Cathode rays were attracted to the positive charge
Cathode rays have a NEGATIVE charge
beam of electrons
7 7 7 7
Atoms are mostly empty space
the atom has a small dense positive region that caused the positive particles to bounce back…..the nucleus
An atom makes up an element. An element can’t be broken down.
one mole = 6.02 X 10 23 atoms
Suggested that the electrons travel around the positively charged nucleus. Difference is that the positive charges are NOT spread out like in Thomson’s Plum Pudding Model.
The number of protons and electrons are the same!
Atomic mass number
Carbon - 14
6 6 6 6
the mass number
Nuclear Symbol Atomic Number Protons Mass Number NeutronsElectrons 713 911 7 76 9 19 4019 20 F9 13 N7 20 9 40 K19 2119
Average atomic mass
1 atomic mass unit (amu)
Protons- nucleus; positive charge Neutrons – nucleus; neutral charge Electrons – electron clouds; negative charge
Have a Periodic Table & a calculator per group!. The mass number.
Democritus – 460 – 370 BC p. 101 Matter consisted of tiny particles “atomos” Ideas were wrong P. 122 – Q - 35.
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Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Table of Contents Chapter 3 Atoms: The Building Blocks of Matter.
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