N
Nitrogen

Hydrogen
Proposed by Dalton

Solid Sphere Model
Element, Compound, Heterogeneous Mixture or Homogenous Mixture?
Aluminum
Element
Element with an atomic mass of 2
O
Oxygen
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Neon
Proposed by Thompson
Plum Pudding
Element, Compound, Heterogeneous Mixture or Homogenous Mixture?
Milk
Homogenous mixture
Element with 11 protons
Sodium
Helium
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Boron
Proposed by Ruterford

Nucelar model
Element, Compound, Heterogeneous Mixture or Homogenous Mixture?
Granola
Heterogeneous Mixture
Na
Sodium
Oxygen
Bohr Model
Element, Compound, Heterogeneous Mixture or Homogenous Mixture?
Salt
Compound
Element with an amu of 40
Calcium
K
Potassium

Silcon
Proposed by Heinsenburg
Electron Cloud Model
Element, Compound, Heterogeneous Mixture or Homogenous Mixture?
Coffee
Homogenous Mixture
An element that has NO neutrons
Hydrogen