Catalyst10 min. Isotopes Review10 min. Ions vs. Isotopes5 min. Cations10 min. Anions10 min. Independent Practice10 min. Break5 min. Quiz30 min.

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Presentation transcript:

Catalyst10 min. Isotopes Review10 min. Ions vs. Isotopes5 min. Cations10 min. Anions10 min. Independent Practice10 min. Break5 min. Quiz30 min.

#1. What is an isotope?

 A:  X:  Z:

X : element symbol

A: Mass Number #protons + # neutrons

Z : Atomic number #protons

Symbol (must write both symbols):  # Electrons:  # Neutrons:

How many protons are in the isotope 39 K? (Potassium-39) 19 (like every atom of Potassium)

 How many neutrons are in the isotope of 26 Mg? Number of Neutrons = A-Z

How many neutrons are in the isotope 43 Sc? 22 neutrons

How many electrons are in the isotope 23 Na? (you can assume the atom is neutral) 11 electrons

 What are the 3 subatomic particles we’ve learned about?  What happens to an atom when the number of protons changes?  What happens when the number of neutrons changes? What’s that called?

ION: an atom that has gained or lost one or more electrons **atoms with the same atomic number (number of protons), but different number of electrons

 An atom that has lost one or more electrons (has an overall positive charge) Naming Rule: element ion

11 Protons 8 Neutrons Na 19 11

11 Protons 8 Neutrons Na 19 11

11 Protons 8 Neutrons Na 19 11

11 Protons 8 Neutrons Na Na +1

11 Protons 8 Neutrons Na Na Sodium Ion

If a neutral Magnesium atom loses two electrons, what will its overall charge be? A. -2 B. +1 C. +2 D. -1 C

How many electrons are in an ion of K +1 ? A. 39 B. 18 C. 19 D. 20 B

 An atom that has gained one or more electrons (has an overall negative charge). Naming Rule: root + “ide” ion

9 Protons 8 Neutrons F 17 9

9 Protons 8 Neutrons F 17 9

9 Protons 8 Neutrons F 17 9

9 Protons 8 Neutrons F 17 9

9 Protons 8 Neutrons F 17 9 F

9 Protons 8 Neutrons F 17 9 F Fluoride Ion

If a neutral oxygen atom gains two electrons, what will its overall charge be? A. -2 B. +1 C. +2 D. -1 A

How many electrons are in an ion of Br -1 ? A. 35 B. 34 C. 36 D. 79 C