Used the word "atomos" to decsribe the uncuttable (indivisible) atom.

• Democritus

• Thomson

• Bohr

• Dalton

What did Aristotle say the four main elements were?

• Earth, air, fire, water

• Ice, Water, Steam, clouds

• Dirt, rocks, sand, cement

• Silicon, Gold, Silver, Carbon

John Dalton said that all atoms of the same element are _________________.

• identical

• indestructible

• indifferent

• ironic

Which scientist discovered the electrons?

• Dalton

• Thomson

• Atristotle

• Bohr

What is a particle with one negative charge called?

• electron

• proton

• quark

• neutron

Tags

NGSS.MS-PS2-3

Who discovered that the nucleus contains positively charged particles called protons?

• Ernest Rutherford
• James Chadwick
• Democritus
• Niels Bohr

Tags

NGSS.HS-PS1-8

What is a particle with one positive charge called?

• proton

• electron

• neutron

• quark

Tags

NGSS.MS-PS2-3

Bohr discovered that electrons are located in

• the nucleus

• inside protons

• electron cloud

• circular orbits around the nucleus

Bohr's model of the atom was called

• Plum Pudding

• Billiard Ball

• Nuclear Model

• Planetary Model

Tags

NGSS.HS-PS1-2

The “fuzzy” representation of electron locations in the quantum mechanical model is called a(n) ________ _____.

• electron cloud

• atomic cloud

• fuzzy area

• atom cloud