​What do we already know?

• ​With a partner discuss what you already know about atoms and what you might like to learn?

  • ​Prompt Questions:

    • ​What are 3 things that contain atoms?

    • ​How many atoms do you think there are in a human body?

​What is an atom?

• The smallest unit of ​an element

• ​The smallest part of matter

  • States of Matter:

    • ​Solid, Liquid, Gas or Plasma

• Consists of a central nucleus surrounded by one or more electrons

What is the nucleus?​

• ​The central part of an atom

• ​Composed of protons and neutrons

• ​Contains most of an atom's mass

​What is a proton?

• ​Positively charged particle

• ​Found within an atom's nucleus

​What is an electron?

• ​Negatively charged particle

• ​Located in the shells that surrounds an atom's nucleus

​What is a neutron?

• Uncharged particle

• Found within an atom's nucleus​

• ​The number of neutrons can be determined by:

  • Atomic mass - atomic number = neutrons

• ​Example:

​Atomic mass : 14

​Atomic #: 7

​14-7=7

​There are 7 neutrons in the element Nitrogen

Bohr Model Activity

​Using M&Ms and the sheet of paper provided, construct a model of an atom.

​Ex. Hydrogen

​1 - Proton (RED M&M)

​0 - Neutron (BLUE M&M)

​1 - Electron (GREEN M&M)

​

​*Notice there are no blue markings because there is no neutron in this element.

Helium (He)​

​2 Protons

​2 Neutrons

​2 Electrons

Lithium (Li)​

​3 Protons

​4 Neutrons

​3 Electrons

​Discussion

​While creating the models of these atoms, have you noticed any patterns?

Beryllium (Be)​

​4 Protons

​5 Neutrons

​4 Electrons

Boron (B)​

​5 Protons

​6 Neutrons

​5 Electrons

Periodic Table Review​

​Periodic Table

• ​A display of the chemical elements

• ​There are over 100 different types of elements

• ​Elements from the same column group typically show similar chemical characteristics

  • ​Ex. Column 2 are all alkaline-earth metals

    • all shiny/silvery white.

    • ​somewhat reactive at standard temp

​Elements on the Periodic Table

• ​The number 1 (top left) indicates the number of protons the element has

  • ​The number of electrons is the same as the number or protons if the element is neutral

    • ​ 1 proton means 1 electron

• ​H is the symbol used to represent Hydrogen

• ​The number 1.00794 (bottom) indicates the atomic weight​