Topic: P6.1.1 Atoms and Isotopes Spec link: P

Topic: P6.1.1 Atoms and Isotopes Spec link: P Time: 75 mins Recorded Assessment: Review: 1. Peermark diagrams. 2. Peermark definition. 3. Peermark symbols. Apply To Demonstrate: 1. Subatomic bingo! 2. Definition of isotope in own words. 3. Students write symbols for carbon isotopes. Agree Learning Outcomes:

1. What is in the nucleus of an atom? 2. What is an Isotope? 3. How do we represent Isotopes? Extension: How do we represent relative abundance of isotopes? Present New Knowledge: 1. Should be existing knowledge from P1.1 Model of the Atom and C1.2 Atomic Structure 2. Video: A is for Atom Part 1 up to 4:18 Only. Display Isotopes of hydrogen. Construct Meaning:

1. Students draw labelled diagram using mass and proton numbers of lithium. Complete table of properties of subatomic particles. 2. Discuss how different isotopes of hydrogen could be described, stating similarities and differences in structure (and properties). 3. Discuss how different isotopes of hydrogen could be displayed as symbols with proton and mass numbers. As you enter the room. https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html House points to whoever

gets the highest score before the lesson starts! P6.1.1 Atoms and Isotopes Learning Questions: 1. What is in the nucleus of an atom? 2. What is an Isotope? 3. How do we represent Isotopes? Extension: How do we work out the average mass of isotopes? LO

Draw a fully labelled diagram of a Lithium atom using the key: Proton Neutron Electron Mass Number 7 Li 3

Atomic Number Other parts to label: Nucleus Electron shells Proton Neutron Electron Mass Number 7 Li

3 Atomic Number Other parts to label: Nucleus Electron shells R Proton Neutron Electron Particle Proton Neutron

Electron Mass Charge R Proton Neutron Electron Particle Mass

Charge Proton 1 +1 Neutron 1 0

0 -1 Electron (almost) Nuclear Bingo Choose any 9 elements from the first 20 on the periodic table (outline below) and place them in a 3x3 grid. House points for the first to get 3 in a row.

P6.1.1 Atoms and Isotopes Learning Questions: 1. What is in the nucleus of an atom? 2. What is an Isotope? 3. How do we represent Isotopes? Extension: How do we we work out the average mass of isotopes? LO What are ISOTOPES ?

Watch this (first 4:17 only) Below are three isotopes of hydrogen. What are their similarities and differences? Give a definition of Isotope: Isotopes are atoms of the same element with the same number of protons and electrons, but different numbers of neutrons. Isotopes have the same atomic number, but different mass numbers. How do you think the similarities and differences between these different isotope of hydrogen affect their properties?

P6.1.1 Atoms and Isotopes Learning Questions: 1. What is in the nucleus of an atom? 2. What is an Isotope? 3. How do we represent Isotopes? Extension: How do we we work out the average mass of isotopes? LO On the left is the normal, common isotope of hydrogen with its symbol.

How would you write the symbol for the others? Play with this.. PhET Simulation Have a go. Can you write the symbol for these isotopes of Carbon? 12 14 6

6 C C P6.1.1 Atoms and Isotopes Learning Questions: 1. What is in the nucleus of an atom? 2. What is an Isotope? 3. How do we represent Isotopes?

Extension: How do we we work out the average mass of isotopes? LO You cant get half a neutron so how can chlorine have a mass of 35.5? Only 75% of chlorine atoms have a mass of 35. The other 25% are isotope with a mass of 37. 35.5 is the average mass of chlorine. Isotopes of other elements are usually so rare that they have

little effect on the average mass. These are often rounded off to the nearest whole number. P6.1.1 Atoms and Isotopes Learning Questions: 1. What is in the nucleus of an atom? 2. What is an Isotope? 3. How do we represent Isotopes? Extension: How do we we work out the average mass of isotopes? LO

Aiming for 4 Aiming for 6 Aiming for 8 Another round of Atomic Bingo with: Look up some common isotopes. Use the data sheet to

calculate the average mass of elements. Show your working Spot the Isotope bonus points! What uses do they have? Are they dangerous? Data sheet

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