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Wednesday, October 27. Warm-up. What are the numbers of protons and neutrons for strontium and Yttrium? Use your notes and write down all six periodic trends that we discuss yesterday. . Warm-up.

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Warm up
Warm-up

  • What are the numbers of protons and neutrons for strontium and Yttrium?

  • Use your notes and write down all six periodic trends that we discuss yesterday.


Warm up1
Warm-up

  • What are the numbers of protons and neutrons for strontium and Yttrium?Useyour notes and write down all six periodic trends that we discuss yesterday.




Trends that we ve discussed
Trends that we’ve discussed are called a

  • Going left to right the atomic number increases

    • Example: Going right across a period the atomic number increases

  • Going left to right the atomic mass increases

    • Going right across a period the atomic mass increases

  • Going right to left the atomic size increases

    • Going left across a period the atomic size increase

  • Going top to bottom the atomic size increases

    • Going down a group the atomic size increases

  • Going left to right the number of valence electrons increases

    • Going right across a period the valence electrons increases

  • Going top to bottom the number of valence electrons stays the same

    • Elements of a group the valence electrons stays the same


Essential idea
Essential Idea are called a

  • What physical property distinguishes one atom from another?

    • The number of protons; the atomic number


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