Early theory of the atom
Which Scientist created the first atomic theory of the atom
John Dalton
What part of the atom was discovered by JJ Thomson?
He discovered the electron
This is the charge of an electron
electrons are negative
This is the number of protons in an oxygen atom
8 protons
Reminder atomic number = number of protons
This is Atomos
In Rutherford's experiment how many particles deflected?
1 in 8000 deflected off the nucleus
Which particle (P,N or E) decide what element we have
Number of protons = atomic number
What is the mass number of a cobalt atom with 30 neutrons
57 amu
27+30
opposite charges ________
Like charges ________
opposite charges Attract
Like charges Repel
Rutherford discovered that a majority of the atom was made of this
Most of the atom is Empty Space
define an ion
an atom with a charge
how many protons/neutrons/electrons are in the following symbol
107 Ag +1
Protons = 47
Neutrons = 60
Electrons = 46
This is the name of the law discovered by Lavoisier
The law of conservation of mass
Matter can neither be created nor destroyed
In Thomson's experiment which plate did the beam bend towards?
How do you calculate the mass number
Mass number = protons + neutrons
What is the symbol for the element with
P=35 N=43 E=36
78 Br -1
bromine with a -1 charge
Draw the plum pudding model of the atom from Thomson
positive sphere with little negative electrons embedded in the surface
What do we call 2 atoms of the element with different masses
calculate the average atomic mass of the following:
N-14 14.003 amu 99.63% abundance
N-15 15.000 amu 0.37% abundance
Weighted mass N-14 13.951
weighted mass N-15 0.0555
Total=14.007 amu