The Periodic Table Atomic Number (number of protons) Symbol Atomic Mass Period.
Have 1 Periodic Table per group!. The mass number.
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Transcript of Have 1 Periodic Table per group!. The mass number.
LIST 2 OF THE 5 STATEMENTS THAT SUM UP DALTON’S ATOMIC
THEORY.
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
LIST 1 MODIFICATION TO DALTON’S ATOMIC THEORY.
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.
DESCRIBE THOMSON’S MODEL OF THE ATOM?
Consisted of a cloud of evenly distributed positive charge with the negative electrons embedded randomly in it.
WHAT IS THE NUCLEAR SYMBOL NOTATION FOR THE
FOLLOWING?: ATOMIC NUMBER = 26; MASS NUMBER = 56
56 Fe
26
HOW DID CATHODE RAYS BEHAVE NEAR POSITIVELY
CHARGED OBJECTS?
Cathode rays were attracted to the positive charge
WHAT DID THESE OBSERVATIONS SUGGEST ABOUT CATHODE RAYS: CATHODE RAYS WERE ATTRACTED
TO THE POSITIVELY CHARGED END OF A MAGNET?
Cathode rays have a NEGATIVE charge
DURING THE GOLD FOIL EXPERIMENT SOME ALPHA
PARTICLES (POSITIVELY CHARGED) PASSED THROUGH THE GOLD
FOIL. WHAT DID THIS SUGGEST?
Atoms are mostly empty space
DURING THE GOLD FOIL EXPERIMENT SOME ALPHA
PARTICLES (POSITIVELY CHARGED) BOUNCED BACK TOWARD THE MAIN SOURCE. WHAT DID THIS SUGGEST?
the atom has a small dense positive region that caused the positive particles to bounce back…..the nucleus
WHAT IS THE DIFFERENCE BETWEEN AN ATOM AND AN
ELEMENT?
An atom makes up an element.
An element can’t be broken down.
RUTHERFORD’S MODEL OF THE ATOM IS CALLED THE “NUCLEAR MODEL”. DESCRIBE THIS MODEL.
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.
Nuclea
r
Symbol
Atomic
NumberProtons
Mass
NumberNeutrons Electrons
7 13
9 11
7 76
9
19 40 19
20 F9
13 N7
209
40 K19
2119
THE WEIGHTED AVERAGE OF THE ATOMIC MASSES OF NATURALLY OCCURRING
ISOTOPES OF AN ELEMENT IS _____________
Average atomic mass
COMPARE AND CONTRAST THE THREE TYPES OF SUBATOMIC
PARTICLES IN TERMS OF LOCATION IN THE ATOM AND RELATIVE
CHARGE.
Protons- nucleus; positive charge
Neutrons – nucleus; neutral charge
Electrons – electron clouds; negative charge