History of Atom

Bohr discovered that electrons are located in

• the nucleus

• inside protons

• electron cloud

• circular orbits around the nucleus

What is a particle with one negative charge called?

• electron

• proton

• quark

• neutron

What is a particle with one positive charge called?

• proton

• electron

• neutron

• quark

What is the center of an atom called?

• nucleus

• electron cloud

• proton center

• photon center

Tags

NGSS.HS-PS1-8

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

• Atoms
• Parts
• Molecules
• Hydrogen

Tags

NGSS.MS-PS1-1

Who was the Greek philosopher who called the smallest particle of matter an "atom"?

• Democritus

• Aristotle

• J.J Thompson

• Einstein

Which of the following is/are conclusions based on Rutherford’s gold foil experiment?

• Atom is mostly empty space

• The nucleus is positively charged

• The atom has a small dense nucleus

• All answers are correct

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.

Tags

NGSS.MS-PS1-1

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

Which of the following is NOT a part of Dalton's atomic theory?

• All elements are composed of atoms.

• Atoms are always in motion.

• Atoms of the same element are always identical.

• Atoms that combine do so in simple, whole-number ratios.

• atoms cannot be created, destroyed, or divided