Chapter 4
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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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Chapter 4

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Chapter 4

Chapter 4


What are subatomic particles

What are subatomic particles?

  • Are parts of matter that make up atoms.

    • protons, electrons, and neutrons


Subatomic particles

subatomic particles

Particle

Symbol

Charge

Mass

Proton

p+

1+

1

Neutron

n

0

1

Electron

e-

1-


Atomic number

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

atoms are neutral

  • the number of protons is equal to the number of electrons

  • the charges balance


Mass number

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

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

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

Home work

  • Section 4.2 work sheet

  • Read section 4.3 page 113 - 118


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