Atomic Theory & Law of Definite Proportions

What were John Dalton three contributions to atomic history?

• Created the atomic theory

• Discovered that the atom is mostly empty space

• Believed that atoms of a given element are identical

• Hypothesized that the atom is a tiny, hard sphere

• Believed that the universe was made of tiny "uncuttable" particles

Tags

NGSS.MS-PS1-1

Who was the first contributor to the atomic theory?

• John Dalton

• Ernest Rutherford

• JJ Thompson

• Democritus

• Neils Bohr

Which scientist saw the atom as a solid sphere?

• Dalton
• Thomson
• Rutherford
• Bohr

Tags

NGSS.MS-PS1-1

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

• Atoms
• Parts
• Molecules
• Hydrogen

Tags

NGSS.MS-PS1-1

states that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

• periodic table

the smallest particle of an element that retains the chemical properties of that element

• ion
• isotope
• atom
• element

Tags

NGSS.MS-PS1-1

True or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus. 

• False
• True 

Which scientist developed the atomic theory?

• JJ Thomson
• Ernest Rutherford
• John Dalton
• James Chadwick

He claimed that matter was made of small, hard particles that he called “atomos.”

• Democritis

• Dalton

• Moseley

• Einstein

Tags

NGSS.MS-PS1-1

Who is credited with founding the "Law of definite Proportions" ?

• Dalton

• Proust

• Democritus

• Coach Eakle