Atomic Theory

What did Thomson discover?

• electron
• proton
• neutron
• electron cloud

The scientist responsible for "discovering" the nucleus is:

• Bohr
• Rutherford
• Schroedinger
• Einstein

Tags

NGSS.HS-PS1-8

What scientist developed the modern atomic theory?

• John Dalton

• JJ Thomson

• Ernest Rutherford

• James Chadwick

Which scientist discovered the neutron?

• John Dalton

• JJ Thomson

• Ernest Rutherford

• James Chadwick

Which of the following states the "electrons will fill orbitals individually before pairing together?"

• Aufbau principle

• Hund's Rule

• Pauli Exclusion Principle

• Quantum Model

In a neutral atom, the number of electrons is equal to the number of ____________.

The _________ gives the number of protons in an atom.

• mass number

• atomic weight

• atomic number

• quantum number

The ___________ is the number of protons and neutrons in the nucleus of an atom.

• mass number

• atomic number

• quantum number

• atomic weight

Tags

NGSS.HS-PS1-8

True/False: an element will have more similar properties with an element in the same column than in the same row.

• True

• False

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

All of the following are parts of Dalton's atomic theory except:

• Atoms of an element identical.

• Matter is composed of atoms.

• Atoms of different elements have the same mass.

• Atoms are not divided in chemical reactions.

Tags

NGSS.HS-PS1-7