Chemestry Quiz - Atomic Structures and Theory

What are the five parts of Daltons Atomic Theory?

• Elements are made of tiny indestructable particles

• All atoms of the same elements have the same properties (identical)

• Nothing can be created nor destroyed

• Atoms combine in different ratios to form compounds (and combine in more than one ratio to form compounds)

• Different elements have different properties

What do you do if an electron is -1?

add an electron

What do you do if an electron is +1?

subtract an electron

How do u find the atomic mass average

isotope abundance x amu = contribution+contribution = average

What is the fomrula to find abundances

(abudance on isotope)(x)+(abundance of other isotope)(100-x)=(atomic mass of element)(100)

Rutherford

Gold foil experiment to discover the. nucleus of the atom

Thomson

Cathpde ray tube experiment to discover the electron

Bohr

Model of electrons orbiting the nucleus like the planets around the sun

Democritus

Called natures basic particle the atom

Dalton

Developed atomic theory

Avogadro

Concluded that there are 6.02210²3 atoms in one molecule of substance

how is an isotope different from a normal atom

different mass/numeber of neutrons