Atomic Model Over Time

Which person/scientist discovered electrons?

• Democritus

• Dalton

• JJ Thomson

• Rutherford

Which of the following ideas about atoms were discovered by Rutherford's Gold Foil experiment? Check all that apply!

• Atoms have a tiny, dense positively charged nucleus.

• Atoms are solid, indivisible spheres.

• Atoms have smaller particles that are negatively charged.

• Atoms are mostly empty space.

Tags

NGSS.HS-PS1-8

Which Greek first had the idea of atoms?

• Aristotle

• Democritus

• Gyro

• Socrates

Which is a neutron?

• A
• B
• C

Tags

NGSS.MS-PS1-1

Where are protons located in an atom?

• nucleus
• electron cloud
• neutron
• who knows?

Tags

NGSS.MS-PS1-1

Electrons have virtually no mass (weight).

• True
• False

Tags

NGSS.HS-PS1-7

The atomic number represents the identity of the ________________.

• mass of the atom
• element
• electrons
• isotopes

He discovered the neutron in the nucleus and completed the current atomic model.

• J.J. Thomson
• Ernest Rutherford
• Niels Bohr
• James CHadwick

He found the positively charged protons in the nucleus and said that electrons moved around the nucleus

• J.J. Thomson
• Ernest Rutherford
• Niels Bohr
• James Chadwick

Tags

NGSS.HS-PS1-8

He found that electrons have specific amounts of energy and move in specific orbits around the nucleus, like planets orbiting the sun. 

• J.J. Thomson
• Ernest Rutherford
• Niels Bohr
• James Chadwick