Unit 3: Atomic Structure

JJ Thompson discovered...

• The electron

• The proton

• The neutron

• The atom

How do you get the atomic charge?

• Atom Charge = # Protons - # Electrons

• Atom Charge = # Protons + # Electrons

• Atom Charge = # Electrons ÷ # Protons

• Atom Charge = (# Protons + # Electrons) ÷ 2

Which are theories of Democritus? (multiple correct answers)

• All matter can be broken down into divisible atoms

• Existence of atoms

• Water atoms are flowy and round

• Iron atoms are jagged, solidly put together

• Matter is continuously divisible and has no smallest unit

All matter is composed of ...

• molecules
• cells
• atoms
• energy

What is wavelength?

• The number of waves per second
• The distance between the crests

• The speed of a wave
• The height of a wave

Who's experiment was this?

• Democritus

• Rutherford

• JJ Thompsons

• Bohrs

Which theory is part of dalton's theories?

• Chemical reactions occur when atoms are separated, joined, or rearranged

• Atoms of different elements can merge to form hybrid atoms

• 1. The weight of an atom was primarily determined by the number of electrons it contains.

  
  

• Energy levels within an atom determine its chemical properties

What is an atom?

• An atom is the smallest particle of an element that retains the properties of the element

• Atoms are made up of photons, neutrons, and electrons.

• Atoms are the building blocks of molecules

What theory did Democritus NOT suggest?

• The existence of atoms

• Water atoms being round and flowy

• Iron atoms being jagged, solidly put together

• That matter is continuously divisible and has no smallest unit

• All matter can be broken down into divisible atoms

... used cathode ray tubes in his experiment

• J.J. Thomson
• Isaac Newton
• Neil Bohrs

• Chadwick