The Development of Atoms

Who discovered electrons?

• John Dalton

• Joseph John Thomson

• Ernest Rutherford

• James Chadwick

The Gold Foil Method through scattering of alpha particles was used to discover what part of the atom?

• protons

• electrons

• neutrons

• nucleus

Tags

NGSS.HS-PS1-8

Which Greek Philosopher believed that matter is composed of tiny particles called atoms?

• Democritus

• Aristotle

• Phytagoras

• Plato

Which among the atomic model is accepted in today's definition of atom?

• plum pudding model

• planetary model

• electron cloud model

• nuclear model

Which among the following sub-atomic particles was discovered first?

• electron

• proton

• neutron

• nucleus

What is the charge of the nucleus?

• +

• -

• 0

Tags

NGSS.HS-PS2-4

Which among the Laws of Matter that can explain the chemical composition of table sugar will always be C₁₂H₂₂O₁₁ and it will never change.

• Law of Conservation of Mass

• Law of Multiple Proportion

• Law of Definite Composition

• Law of Matter and Energy

What is the symbol of the element Mercury?

• Me

• Hg

• Mc

• Ag

These atoms of a specific element may have different atomic number because of the changes in the number of neutrons. What do you call these atoms?

• Cations

• Isotopes

• Allotropes

• Anions

Tags

NGSS.HS-PS1-8

Who proposed this atomic model?

• Neils Bohr

• Ernest Rutherford

• Erwin Schrödinger

• James Chadwick