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Day 5

Day 5. Notes (3/4 & 7/8) Nuclide Symbols Nuclide symbols for Ions Practice – pg5-6. Reminder…. Mass Number = # protons + # neutrons Atomic Number = # protons # electrons = # protons (neutral atom). Atoms can be represented in different ways.

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Day 5

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  1. Day 5 Notes (3/4 & 7/8) • Nuclide Symbols • Nuclide symbols for Ions • Practice – pg5-6

  2. Reminder… • Mass Number = # protons + # neutrons • Atomic Number = # protons • # electrons = # protons (neutral atom)

  3. Atoms can be represented in different ways.. • Nuclide Symbols: Contain the symbol of the element, the mass number and the atomic number • , , • Or the symbol or name of the element can be written, followed by a hyphen and the mass number • Carbon-14 • C-14

  4. X Mass number # protons Atomic number # protons + # neutrons mass number Nuclide Symbols Contain the symbol of the element, the mass number and the atomic number

  5. + F 19 9 Nuclide Symbols • Find the • number of protons • number of neutrons • number of electrons • Atomic number • Mass number = 9 = 10 = 9 = 9 = 19

  6. Nuclide Symbol • Write the nuclide symbol for a potassium atom that has 20 neutrons. K 39 19

  7. Lets Try a Few…Write the Nuclide Symbols • A lithium atom with 4 neutrons • A sulfur atom with 15 neutrons Li 7 3 S 31 16

  8. Elements can also be represented by writing… • the symbol or name of the element, followed by a hyphen and the mass number. Ex: Carbon-14 Now write nuclide symbols for the following: • Copper- 64 • A Sulfur atom that has 17 neutrons • Potassium- 39 64 29 Cu 33 16 S 39 19 K

  9.  Practice  • Please practice drawing nuclide symbols by completing the charts on page 3 - 4 in your Packet O Fun!!

  10. Nuclide Symbols for Ions • What is an ion? • An ion is a charged particle • It could be positive or negative • But, how does an ion get a charge??? • & what does that do to the number of protons, electrons, and neutrons?

  11. Charges • An atom that has more protons(+) than electrons, has a positive charge. • An atom that has more electrons(-) than protons, has a negative charge. • If an atom has 2 more protons(+) than it does electrons, it has a +2 charge. • If an atom has 3 more electrons(-) than it does protons, it has a -3 charge.

  12. Nuclide Symbols for an Ion Find the • number of protons • number of neutrons • number of electrons • Atomic number • Mass number = 8 O = 8 16 2- = 10 8 = 8 = 16 Oxygen ion

  13. Example • 40K+1 , Determine the number of protons, neutrons, and electrons.

  14. Lets Try a Few! • Determine the number of electrons, protons, and neutrons in the following: • 81Br -1 • 18N-3

  15.  Practice  • Please practice your knowledge of ions by completing the chart on pg5-6 in your Packet O Fun!!

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