Rutherford and Thomson said…. :
Rutherford and Thomson said…. Positive nucleus with most of the mass
Proton and Neutrons
Mostly empty space with negative electrons
How many? :
How many? For normal atoms, the number of protons is the atomic number on the periodic table.
How many? :
How many? For normal atoms, the number of neutrons is the mass number (rounded to a whole number) minus the atomic number on the periodic table. Mass Number = 58.93 Rounded = 59
59-27 = 32 neutrons
How many? :
How many? For normal atoms, the number of electrons is the atomic number on the periodic table.
Bohr said… :
Bohr said… Electrons are in levels around the nucleus
The row of the periodic table tells you how many levels.
The number to the left tells you how many you can put in each level 2
8
8
18
18
32
32
Slide 7:
27 p+ 32 n 27 e-