Concept for Dot&Cross Sim for Ionic Bonding 9Sep2020 by David

 

20201002

16 Oct 2020

1st Message Box when the simulation is started:

(1) Choose the Metal and Non-metal for the ionic compound.

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(2) Then refer the Periodic Table below to determine the number of electrons in the

atoms.

Note: Bold the text to make it clearer.

The text box should always appear in the centre of the screen.

If the number of electrons selected is correct:

Correct!

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(1) Drag the electron (● / x) from the legend onto the boxes in the diagram.

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(2) Then click the dotted square brackets.

If the number of electrons selected is wrong:

Incorrect!

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Refer the Periodic Table below to determine the number of electrons in the atom.

When all is completed and the student click the “Check” button…

If Correct:

Correct!

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Choose another Metal and Non-metal for a new ionic compound.

If Wrong:

Incorrect!

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Hint 1: How many electrons must the atom gain or lose to become stable?

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Hint 2: How many positive ions and negative ions are needed so that the total

positive charge cancels the total negative charge.