| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Before the discovery of protons, neutrons and electrons, scientists attempted to classify the elements by arranging them in order of their atomic weights. |
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How were elements in early periodic tables ordered? periodic table battle ships:
Stretch: using symbols and names
Challenge: using group numbers and period numbers
Super challenge: using proton and mass numbers |
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The early periodic tables were incomplete and some elements were placed in inappropriate groups if the strict order of atomic weights was followed. |
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Why were early attempts at ordering the periodic table by atomic mass unsuccessful? |
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Students should be able to explain how the atomic structure of metals and non-metals relates to their position in the periodic table |
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Mendeleev overcame some of the problems by leaving gaps for elements that he thought had not been discovered and in some places changed the order based on atomic weights. |
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How did Mendeleev predict the existence of several undiscovered elements when designing his periodic table? Show students previous versions of periodic table and ask to identify the major differences |
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Elements with properties predicted by Mendeleev were discovered and filled the gaps. |
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Ask students to apply knowledge from lesson 1 electronic configuration why Mendeleev might have left gaps |
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Metals are found to the left and towards the bottom of the periodic table. Non-metals are found towards the right and top of the periodic table. |
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How are metals and non-metal elements arranged on the periodic table quiz testing knowledge and use of the periodic table to identify if elements are metals or non-metals and if they are proton donors or accepters. |
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Knowledge of isotopes made it possible to explain why the order based on atomic weights was not always correct. |
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GF: Why are isotopes chemically similar but physically different? |
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Students should be able to describe these steps in the development of the periodic table. |
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What steps were involved in the development of the periodic table? Drama piece to remember the names of different scientists involved in the development of the periodic table and the steps involved at each stage in contributing towards the periodic table.
(https://www.youtube.com/watch?v=pt55ttIaPX0) |
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