Atomic Theory

Atomic Theory
Engage & Explore

Fear of Snow is called chionophobia

Phobos - fear
Chion - snow

​​FUN FACTS

​Erie, Pennsylvania had the most snow last year with 198.5 inches!

Every year, about 1 septillion ice crystals fall to Earth. That is a 1 with 24 0's after it!

​​FUN FACTS

Gravity

Electromagnetism - magnetic fields, light and electric fields

Nuclear Forces - 2 Types
Strong
Weak

​

​Forces of Nature

Believed that could cut matter into smaller pieces until reach smallest piece, he named the ATOM.

​

​Atomic Models:
Democritus

2,000 years later:
- suggested that atoms are spheres that combine to form matter
- Broke water (H2O) down to hydrogen and oxygen​

​Atomic Models: John Dalton

Found subatomic particles he called electrons with a negative charge.

He thought the electrons were located in a sea of positive charged particles, called the plum pudding model.

​

​Atomic Model: JJ Thomson

Believed thru testing that atom not positive all over but only in center, he called NUCLEUS.

Also believed there was a lot of empty space in atom with electrons circling.

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Atomic Model: Ernest Rutherford

Observed when energy added to atom, the electrons moved farther away from nucleus. ​

Believed electrons had certain orbits around the nucleus, called energy levels.

​Atomic Model: Niels Bohr

Cells vs Atoms

​Both called building blocks but......

Millions of atoms make up a single cell

Categorize

Options (4)

Model claims that atoms are indivisible.

Model predicts the existence of negative subatomic particles in a sea of positive charges.

Claimed there were positive subatomic particles and they were found in nucleus.

Model proposes energy levels of electrons exist.

Organize these atomic models to its claim or prediction.

Dalton's model

Thomson's model

Rutherford's model

Bohr's model

Multiple Choice

Atoms are basic building blocks of all matter.

• True

• False

Multiple Choice

Atoms are made up of cells.

• True

• False

The Atom is made up of

Protons - Positive charge
Neutrons - No electrical charge
Electrons - Negative charge


Protons and Neutrons are made of smaller particles called Quarks.

Made up of protons and neutrons.

​Electrons orbit the nucleus.

The nuclear force holds nucleus together.

​Nucleus

Found outside the nucleus.

Far away from nucleus so lots of empty space in atom!

Orbit in clouds, such as example on right.

​

​Electrons

Multiple Choice

Protons and neutrons are the smallest particles.

• True

• False

Multiple Select

What part of the atom is made up of smaller parts called Quarks?

• Protons

• Neutrons

• Electrons

Vocab
Check

Dropdown

In an atom, the nucleus is made up of ​

Select answer

, positively charged particles and ​

Select answer

, particles with no charge.

Match

Match the following

• Proton

• Neutron

• Electron

• Nucleus

• Electron shell

Positively charged particle in nucleus

Particle with no charge in nucleus

Negative charged particle orbits nucleus

Center of atom

Orbital paths of electrons

• Positively charged particle in nucleus

• Particle with no charge in nucleus

• Negative charged particle orbits nucleus

• Center of atom

• Orbital paths of electrons

Multiple Select

Which of the following is formed from smaller pieces called Quarks?

• Proton

• Neutron

• Electron

​What do you notice about the table?

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Periodic Table of Elements