EXPLAIN Atomic Particles

​The Atom

​Matter is anything that has mass and volume (takes up space).​

The ATOM is the basic unit of an element whose parts determine the properties of the element.​

The atom is made of three subatomic particles: protons, neutrons and electrons.

​The Atom

Complete the below statements using your notes on atomic history.​

This model is called ________________. ​

I think it is (good/bad) representation of an atom, because _________________.​

​The Nucleus

• ​center of the atom ​

• holds neutrons and protons ​

• most dense part of the atom

​Protons

• positive charge ​

• has a mass of 1 amu

  • greater mass than electrons

  • mass is equal to neutrons

• identifies the element

• number of protons is equal to the number electrons in a neutral atom

​NUCLEUS

​Neutrons

• neutral charge ​

• has a mass of 1 amu

  • greater mass than electrons

  • mass is equal to protons

​NUCLEUS

​The Electron Cloud

• outside of the nucleus ​

• holds electrons

• has shells or layers known as orbits or energy levels ​

• electrons move within the energy level, but their exact location cannot be predicted

​Electrons

• negative charge ​

• has a mass of 0.0005 amu

  • smaller mass than protons and neutrons

• determines chemical properties and bonding

• number of electrons is equal to the number protons in a neutral atom

​CLOUD

​The Bohr (or Planetary) Model of the Atom​

Benefits:​

• protons and neutrons are shown in the nucleus​

• used to show electron energy level placement ​

​

Limitations:​

• electrons do not travel in perfect rings ​

• does not work as well for larger atoms

​Label the parts of a Bohr Model

​The Electron Cloud Model of the Atom​

Benefits:​

• a more accurate model of electron behavior ​

• electrons are shown as a “cloud” around a dense nucleus ​

• a better model for larger atoms

​

Limitations:​

• does not show the energy levels (shells) ​

• makes it harder to show how many electrons in each shell ​

• does not show number of protons and neutrons

​Check for Understanding​

Are you able answer the following questions?​

• What are the benefits and drawbacks of the Bohr’s model of the atom?​

• What are the benefits and drawbacks of the Electron Cloud model of the atom?​

• The slide that has the moving electrons on it, what are the benefits and drawbacks of that model of the atom?​

• If you were to create a model of an atom, describe or draw how you would model an atom that has 2 protons, 2 neutrons, and 2 electrons. Why did you choose this model?

Multiple Select

What are the benefits of the Bohr’s model of the atom?​

• protons and neutrons are shown in the nucleus​

• a more accurate model of electron behavior ​

• electrons are shown as a “cloud” around a dense nucleus

• used to show electron energy level placement

Drag and Drop

If I create a model of an atom that has 2 protons, 2 neutrons, and 2 electrons, I would draw a ​

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, because it is a ​

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number of subatomic particles, and I can show the exact number of ​

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and neutrons in the nucleus, and the correct number of ​

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in the energy levels.

Drag these tiles and drop them in the correct blank above

Bohr Model

Electron Cloud

protons

electrons

neutrons

small

large

Multiple Select

What are the drawbacks (limitations) of the Electron Cloud model of the atom?

• does not work as well for larger atoms

• does not show the energy levels (shells)

• electrons do not travel in perfect rings ​

• does not show number of protons and neutrons

Multiple Select

What does the nucleus of an atom contain?

• electrons

• neutrons

• protons

Multiple Choice

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons and neutrons

Multiple Choice

__________ are negatively charged particles that are in the orbitals around the nucleus.

• Protons

• Neutrons

• Electrons

Dropdown

The number of ​

Select answer

is equal to the number of electrons in a ​

Select answer

atom.

​Glue your notes in your notebook.