Atoms and periodic table Flashcards
Name the three models of the history of the atom
Dolton’s atomic model (Democritus), Thomson’s plum pudding model and Rutherford’s nuclear model
What was Dolton’s atomic model
The idea of indivisible particles called the atom
What was Thomson’s plum pudding model
The idea of negative charge embedded in a big positive charge
What was Rutherford’s nuclear model
Atoms have a central positive nucleus
What is an element
A substance that is only made up of one type of atom
What is the smallest part of an element
An atom
What subatomic particles is an atom made of
A proton, an electron and a neutron
What is a nucleus
The centre of an atom that contains protons and neutrons
Describe the structure of an atom
In the centre of an atom there is a nucleus that is made up of protons and neutrons
Electrons are arranged in shells around the nucleus
Shells fill from the inside out
What is the maximum number of electrons in the first shell
2
What is the maximum number of electrons in the second shell
8
What is the maximum number of electrons in the third shell
8
What is the atomic number of an atom
The number of protons = the number if electrons
What is the mass number of an atom
The number of protons + the number of neutrons
What number is at the top of an atom in the periodic table
The mass number
