Subatomic
Particle with a positive charge _____________
Proton
Rows going across the periodic table are called
Periods
atomic number
Number of protons
If an element has 3 electrons and 3 proton which element are referring to?
Lithium
There are 4 elements
Aristotle
Has no charge.
Neutron
Vertical columns on the periodic table are called
groups or families
Mass number
Protons plus neutrons
the number of elements found in nature
118
Said that matter is made up of ATOMOS
Democritus
Has a negative charge
Electron
Type of elements found to the left side of the stairstep are called
Metals
Letter or letters representing an element
Atomic symbol
How many neutrons would be in a Lithium atom that has an atomic number of 3 and an atomic mass of 7?
4
Discover the proton
Rutherford
Particles found in the nucleus of the atom:
Protons and Neutrons
Dalton proved who's theory?
Democritus
Matter is made up of
atoms, elements and compounds
C-13 has how many neutrons?
7
Cathode Ray Tube
Thomson - electrons
Particle found in energy levels around the nucleus.
Electrons
The elements to the upper right of the stairsteps; take electrons or share them
Nonmetals
Same element with different number of neutrons are called
isotopes
Calcium Mass number is 40, how many protons it has?
20
Electrons are in an electron cloud.
Schrodinger and Heisenberg