a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns.
What is the Periodic Table?
100
Dmitri Mendeleev.
Who invented the Periodic Table?
100
Hydrogen
What is H?
100
1
What is Hydrogens protons?
100
Cu
What is Copper?
200
A pure substance made up of one kind of atom that cannot be broken down into simpler substances by physical or chemical means
What is an Element?
200
In the 1960's he devised a periodic table where the elements were ordered my their atomic masses.
Who is Dimitri Mendeleev?
200
Sodium
What is Na?
200
11
What is Sodiums proton?
200
Ag
What is Silver?
300
The electron is a subatomic particle with a negative elementary electric charge.
What is Electrons?
300
The characteristics of the missing elements because of the Periodic Law
What were Dimitri Mendeleev's predictions?
300
Calcium
What is Ca?
300
79
What is Golds proton?
300
Au
What is Gold?
400
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
What is a Proton?
400
Henry Moseley.
Who created the atomic number?
400
Iron
What is Fe?
400
2
What is Heliums proton?
500
A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
What is a Neutron
500
John Dalton and Thomas Thomson between 1803 and 1805 and Jöns Jakob Berzelius between 1808 and 1826.