Atoms and Elements

Atoms and the Periodic Table

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What is an atom?

• An atom is the building block of all matter.

• Atoms are very small; smaller than the tip of your pencil.

• Atoms are composed of particles called protons, electrons and neutrons.

• Atoms can join together to form molecules, which in turn form most of the objects around you.

Multiple Choice

What is at the center of every atom?

• an electron

• only protons

• a molecule

• a nucleus

The Periodic Table of the Elements

• display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties

• The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right.

• The columns, called groups, contain elements with similar chemical behaviors. 

Multiple Choice

What is the Periodic Table?

• a chart that lists all the molecules that exist in the universe

• a chart that shows all the elements scientists have discovered

• a chart that shows all the compounds found in the world

• a chart that shows what time periods elements were discovered in

Chemical Element

• Atomic number- tells the number of protons, electrons and the location of the element on the Periodic Table

• Atomic Mass- the sum of the protons and neutrons in the nucleus of the atom

• To find the number of neutrons, subtract the atomic number from the atomic mass

• APE MAN

Multiple Choice

What does an element's atomic number represent?

• the element state at room temperature

• how metallic an element is

• the number of atoms in a compound

• the number of protons in an element

Electron Shell Rules:

1st shell can hold up to 2 electrons

2nd shell can hold up to 8 electrons

3rd shell can hold up to 18 electrons

Multiple Choice

Which of the following is the correct atomic model for Boron?

Multiple Choice

How many neutrons are in Potassium?

*Click the image to make it larger.

• 19

• 20

• 39

• 58

The three basic states of matter

Multiple Choice

At higher temperatures

• particles in an object have less energy

• particles in an object move faster

• a gas contracts

Multiple Choice

How is a gas defined?

• no shape, no volume

• Definite shape, definite volume

• Found in stars

• Definite volume, no shape

All matter have properties.

Multiple Choice

Physical properties are

• are properties that can be observed without changing the matter's identity

• are properties that can be observed that change the matter into new matter with new properties

Multiple Choice

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• melting

• formation of a gas

• dissolving

Poll

How would you rate your understanding of atoms and the Periodic Table?