Scientists
Which Scientist thought the Atom was a solid sphere?
John Dalton
ABXC
Which letter represents the Atomic number?
B
What is the charge of a cation?
pawsitive
Electrons on the outer layer are called what?
Valence
What is the formula for average atomic mass?
(mass1)(%1)+(mass2)(%2)=
What Did JJ Thompson Discover and what was his experiment?
Electrons, The Cathode Ray Rxpiriment
ABXC
Whick letter is the mass?
A
If an element has a charge of -3 what happened to its electrons?
gained 3
How many electrons can fit on each level?
(Hint) 2 answers
2 on the first level
8 on the rest
What does the average atomic mass shown on the periodic table represent?
the average of all known isotopes
What was wrong about the Plum Pudding model?
It is missing the nucleus
ABXC
How do you find the number of neutrons?
A-B
if an element has no charge how many electrons does it have?
same number as protons/ =Atomic #
draw the lewis dot structure for Potassium
one dot
What is the atomic mass if en element is 80% Cr-51, 20% Cr-52
51.2 amu
What experiment did rutherford perform?
Gold foil expiriment
What element has a mass of 107 and has 60 neutrons?
Ag
How many electrons does Cu+1 have?
28
draw the lewis dot structure for iodine
7 dots
what is the average atomic mass if 30% Re-185, 50% Re-186, 20% Re-187
185.9 amu
What did Bohr Discover
That electrons existed in energy shells
How many Neutrons does 20481Ti have?
204-81=123
How many electrons does Sn-4 have?
54
what part of the periodic table tells us how many valence electrons an element has?
group number
if the Average atomic mass of Oxygen is 15.99 and has three isotopes
80% Oxygen 16
15% Oxygen 17
5% Oxygen ???what is the missing isotope?
12.8