Beginnings of Chemistry

What was the study that led to the founding of chemistry?

• biology

• physics

• alchemy

• history

A (a)   is a positively charged particle found in the nucleus of an atom.

A (a)   is a subatomic particle that has no charge and that is found in the nucleus of an atom

Tags

NGSS.MS-PS1-1

An (a)   is a negatively charged subatomic particle that is not in the nucleus.

All matter around us is made of indivisible tiny particles- “atomos”

• Dalton

• Democritus

• Thomson

• Cloud Model

Tags

NGSS.MS-PS1-1

Elements are made of tiny particles called atoms. Atoms of one element are identical while atoms of different elements are different.

• Democritus

• Rutherford

• Bohr

• Dalton

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NGSS.MS-PS1-1

Positive charge is not like a pudding, but concentrated in the nucleus as shown in the Gold Foil (alpha particle) experiment

• Thomson

• Rutherford

• Bohr

• Cloud Model

Discovered atoms have negative particles (electrons). Often called the Plum Pudding Model.

• Democritus

• Dalton

• Thomson

• Rutherford

Tags

NGSS.MS-PS1-1

Electrons orbit the nucleus.

• Democritus

• Rutherford

• Bohr

• Electron Cloud Model

They act as glue that holds the nucleus together.

• Importance of neutrons

• Importance of protons

• Importance of electrons