Atomic History
The smallest building block of matter
What is the atom?
The subatomic particle with a negative charge
What is an electron?
The scientific term for the way in which electrons form 'layers' around the nucleus of the atom
What are electron energy levels (shells)?
The scientific term used to describe the way in which electrons are put into shells around the nucleus
What is electron configuration?
The scientist who organised the periodic table as it is today
Who is Dmitri Mendeleev?
Greek philosopher who suggested that all substances consist of tiny indestructible particles
Who is Democritus?
The two subatomic particles which compose the nucleus
What are protons and neutrons?
The electrons are attracted to the nucleus of the atom because of ....
What is the nucleus' positive charge?
The maximum number of electrons that can fit into the first 3 shells
What is 2,8,8?
Each __________ of the periodic table has the same number of valence electrons
What is a group (column)?
Scientist who hypothesised that all atoms of the same element were alike
The subatomic particles with negligible mass
What are electrons?
The scientific term used to describe the state that electrons are in when they gain energy
Electrons are filled in from this shell first
What is the electron shell closest to the nucleus?
All element in the same _________ have the same number of electron shells
What is a period (row)?
Scientist who hypothesised that the atom was mostly empty space with a dense nucleus
Who is Lord Rutherford?
The number which defines an element (also equal to the number of protons)
What is the atomic number?
Electrons jump up an energy level
What is the absorption of energy?
The electrons in the outermost shell
What are the valence electrons?
The most reactive elements are in this corner of the periodic table
What is the bottom left corner?
Scientist who proposed that the electrons orbit the nucleus in discrete 'energy levels'
Who is Niels Bohr?
The number of protons and neutrons in an atom
What is the atomic mass (weight)?
Electrons release a characteristic coloured light during this process
What is electron emission (jump to a lower energy level)?
The electron configuration of sodium (atomic number 11)
What is 2, 8, 1?
The most reactive metal on the reactivity series
What is potassium?