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Understanding Protons, Neutrons, and Periodic Trends in Strontium and Yttrium

In this warm-up session, we explore the atomic structure of strontium and yttrium by identifying their numbers of protons and neutrons. We'll also recap six fundamental periodic trends discussed in our previous lesson. Key concepts include how atomic number and atomic mass change across periods, the relationship between atomic size and group positioning, and the consistency of valence electrons within groups. Understanding these trends is essential to distinguishing one element from another based on their protons.

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Understanding Protons, Neutrons, and Periodic Trends in Strontium and Yttrium

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Presentation Transcript

  1. Wednesday, October 27

  2. 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.

  3. 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.

  4. A group of elements on the same row are called period. • So as you go across a period from the left to the right the atomic number (protons) and atomic mass increases.

  5. Elements that are in the same vertical column (up and down) are called a group or family. • A group of elements all have the same number of valence electrons.

  6. Trends that we’ve discussed • 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

  7. Essential Idea • What physical property distinguishes one atom from another? • The number of protons; the atomic number

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