Where are protons located
Nucleus
What model was introduced in 1913
The Bohr model or Rutherford-Bohr model
The most reactive metal
Francium
H
hydrogen
He
Helium
Where are electrons located
Electron cloud
what model was introduced in 1911
Rutherford model which is also known as Rutherford atomic model
The most reactive nonmetal
Fluorine
Li
Lithium
The 4th element
Beryllium
Where are neutrons located
Nucleus
When was the atom found
Around 450 B.C
Least reactive nonmetal
Helium
Mg
Magnesium
Metalloid in group 13
Boron
Where is the nucleus
The center of an atom
Who discovered the atom
Democritus
Least reactive metal
Lithium
Pb
Lead
Has the mass of 14.007
Nitrogen
Where is the electron cloud located
The area around the nucleus
Who re introduced the atom
John Dalton
The first element
Hydrogen
Fe
Iron
What is the name of J.J Thompsons model
The plum pudding model