The Periodic Table (Week 2)

The Periodic Table (Week 2)

Year 10

What will we cover today?

• What you should remember from last week

• How the PT is structured

• How to read information from the PT

• How to determine the subatomic particle numbers of a particular element

Multiple Choice

What are the subatomic particles present in an atom?

• Nucleus, protons, electrons

• Protons, neutrons, electrons

• Protons, neutrons

• Nucleus, neutrons, protons

The Periodic Table

• Mendeleev is the scientist credited with developing the majority of the PT - he did so through deduction and reasoning

• He predicted the existence of elements that weren't even discovered yet through their properties (mass, density, melting point etc.)

Modern Periodic Table

• 118 elements - 94 natural

• Can sort it into metals, non-metals, and metalloids (+ many more families, but we don't need to know them!)

• Sorted into groups (down) and periods (across)

• Each element has an atomic number (goes up by 1), atomic mass, name, and symbol

​Determining subatomic particles

• Protons = atomic number

• Electrons (in an neutral atom) = atomic number

  • in an ion = number of electrons when the atom has a full outer shell

• Neutrons = mass number - atomic number

Multiple Choice

How many protons does this element have?

• 14

• 21

• 7

Multiple Choice

How many electrons does this element have?

• 30

• 15

• 31

Multiple Choice

How many neutrons does this element have?

• 79

• 118

• 196

• 197

Multiple Choice

How many neutrons does this element have?

• 41

• 68

• 32

• 72

​Isotopes

​Isotopes are different forms of a particular atom.

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Different isotopes have different numbers of neutrons in their nucleus, but have the same number of protons

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The number = the mass ​

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Often have different physical properties ​

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Multiple Choice

What do carbon-12 and carbon-14 have in common?

• they have same number of protons
• they have the same number of neutrons
• they have the same atomic mass
• they have the same atomic weight

Multiple Choice

What can you conclude about carbon-14 from its name?

• It has 14 electrons
• it has 14 neutrons
• it has 14 protons
• it has an atomic mass of 14 u

Poll

How confident do you feel with the content we went through today?

• Super confident - I feel like I could answer pretty much any question correctly!

• Somewhat confident - I need some more practice/time to help me understand.

• Not very confident - I definitely need some more time and practice to understand what's going on.

• I'm really lost - I didn't understand much at all and would maybe like some extra information/help.