Have a Periodic Table & a calculator per group!.  The mass number.

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Presentation transcript:

Have a Periodic Table & a calculator per group!

 The mass number

 true

2.75 g Al 1 mol Al 27 g Al 27 g Al = mol Al = mol Al

 6.02X10 23 Al atoms

 Protons & neutrons

 The Nuclear Model

 positive

 The Plum Pudding Model

0.75 mol Na 6.02x10 23 atoms Na 1 mol Na 1 mol Na = 4.5x10 23 mol Na = 4.5x10 23 mol Na

 proton

 grams

 amu (atomic mass unit)

2.5x10 15 atoms of Au 1 mol Au 6.02x10 23 atoms Au 6.02x10 23 atoms Au = 4.0x10 -9 mol Au = 4.0x10 -9 mol Au

 Neutrons

 J.J. Thomson

 Ernest Rutherford

 John Dalton

 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

 NO!!

 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.

 James Chadwick

 J.J. Thomson

 Theory

 Cathode Ray Tube

 8 8 8 8

 Mass Number

 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

0.25 mol Pb 207 g Pb 1 mol Pb 1 mol Pb = g Pb = g Pb

 Cathode rays were attracted to the positive charge

 Cathode rays have a NEGATIVE charge

 beam of electrons

 7 7 7 7

 Democritus

 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.

 positive

 one mole = 6.02 X atoms

 neutral

 MOLE!!

 Scientific Law

 NUCLEUS

 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.

 NEUTRONS!

 The number of protons and electrons are the same!

 Their mass number

 Carbon - 14

 11

 6 6 6 6

 Molar Mass

 the mass number

Nuclear Symbol Atomic Number Protons Mass Number NeutronsElectrons F9 13 N K

 Average atomic mass

 1 atomic mass unit (amu)

 negative