6 - Unit 1, Section 1 - Day 2

Matter: How The World Is Built

Unit 1, Section 1

Every atom is made of the same three subatomic particles:

• Protons

• Neutrons

• Electrons

Subatomic Particles!

Protons, Neutrons, and Electrons

​	​Proton	Neutron​	​Electron
​Electric Charge	​Positive	Neutral (Zero)​	Negative​
Size​	​Large	Large​	Small​
Location	Nucleus	​Nucleus	​Orbit Around The Nucleus

There are 118 elements (that we know of)

Every one of them is made of atoms

All atoms are made of protons, neutrons, and electrons

Look At All These Elements

Open Ended

If all atoms are made of the same protons, neutrons, and electrons, how do you think we have 118 different elements?

The number of protons determine what type of atom you have

• They define the element

• For example, every atom of carbon has six protons in its nucleus

Protons!

Neutrons make the atom stable

• Without neutrons, the nucleus would be made of just protons

• And like charges repel, so the nucleus would break apart

• They hold the nucleus together

Neutrons!

Electrons balance the charge of the atom

• For every positive proton, there is a negative electron to balance it out

• The entire atom has zero charge

Electrons!

Fill in the Blank

The _______ is the center of the atom.

Multiple Choice

Which subatomic particle has a negative electric charge and orbits around the nucleus?

• Proton

• Neutron

• Electron

Multiple Choice

Which subatomic particle has a positive electric charge and is found in the nucleus?

• Proton

• Neutron

• Electron

Fill in the Blank

________ make atoms stable by holding the protons together in the nucleus.