Structure Of Atoms Flashcards
What is the relative mass of protons, neutrons and electrons?
Protons- 1
Neutrons- 1
Electrons- 0
What is the electrical charge of protons, neutrons and electrons?
Protons- +1
Neutrons- 0
Electrons- -1
What is the nucleus made of?
Protons and neutrons
What orbits the nucleus on shells?
Electrons
What is the atomic number?
The number of protons
Theoretically electrons
What is the relative mass of an element?
The no. of protons + no. of neutrons
Electrons have a mass of 0
How many electrons can the first shell hold?
2
How many electrons can the 2nd and 3rd shell hold?
8
Whats the equation for relative mass?
Relative % mass =
(Isotope % * mass) +
(Isotope % * mass) /
100
Why do atoms have no charge overall?
The protons and electrons cancel each other out
Neutrons have no charge
The gold foil experiment showed?
Atoms must have a dense positive center
Most of the atom is empty space