Atomic Theory

What contribution did John Dalton make to atomic theory?

• He discovered that every atom was positively charged.

• He discovered that every element consisted of one type of atom.

• He discovered that atoms had nuclei.

• He discovered that atoms could be divided into smaller parts.

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Tags

NGSS.MS-PS1-1

Who stated that all atoms of the same element are excacty alike?

• Democritus
• Dalton
• Thomson
• Borh

J.J. Thomson provided evidence that an atom...

• is the smallest particle of matter
• contains negatively charged particles
• has an overall negative charge
• has an overall positive charge

Tags

NGSS.MS-PS1-1

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.

• alpha particles have a positive charge.

• gold is not a dense as previously thought.

• there is a dense positively charged nucleus at the center of an atom.