Chapter 4

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# Chapter 4 - PowerPoint PPT Presentation

Chapter 4. What are subatomic particles?. Are parts of matter that make up atoms. protons, electrons, and neutrons. subatomic particles. Particle. Symbol. Charge. Mass. Proton. p +. 1+. 1. Neutron. n. 0. 1. Electron. e -. 1-. Atomic Number. Is the number of protons in an atom.

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Presentation Transcript

### Chapter 4

What are subatomic particles?
• Are parts of matter that make up atoms.
• protons, electrons, and neutrons
subatomic particles

Particle

Symbol

Charge

Mass

Proton

p+

1+

1

Neutron

n

0

1

Electron

e-

1-

Atomic Number
• Is the number of protons in an atom.
• all atoms of an element have the same number of protons
• Each element has a unique atomic number
atoms are neutral
• the number of protons is equal to the number of electrons
• the charges balance
Mass Number
• is the total number of protons plus neutrons.
• For example Oxygen contains 8 protons and 8 neutrons so its mass number is 16
• to find the number of neutrons subtract the number atomic number from the mass number.
• number of neutrons = mass number - atomic number.
How many neutrons does Gold-197 have?
• gold has a atomic number of 79 and a mass number of 197.
• number of neutrons = mass number - atomic number
• number of neutrons = 197 – 79
• number of neutrons = 118
Isotopes
• are atoms of the same element with different numbers of neutrons.
• isotopes have different mass numbers
• to distinguish isotopes, isotopes are referred to by there mass numbers
• Example Oxygen-16 and Oxygen-17
• Oxygen-16 has 8 p+ and 8 n
• Oxygen-17 has 8 p+ and 9 n
Home work
• Section 4.2 work sheet
• Read section 4.3 page 113 - 118