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SingaporeChemistryQuick questions
Atomic Structure and Chemical Bonding
Quick questions on Ionic bonding explained: O-Level Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is working out the charge on an ion?Show answer
The charge equals the number of electrons gained or lost to reach a full shell:
What are dot-and-cross diagrams?Show answer
A dot-and-cross diagram shows the outer-shell electrons of the metal as crosses and of the non-metal as dots (or vice versa). For sodium chloride, the single sodium outer electron is transferred into the chlorine outer shell; the diagram shows with an empty outer shell (or the shell below now outermost) and with eight outer electrons, each ion drawn in square brackets with its charge.
What is q1?Show answer
State what happens to electrons when an ionic bond forms between a metal and a non-metal. [1 mark]
What is q2?Show answer
Give the formula of the compound formed between calcium () and chloride (). [2 marks]
What is q3?Show answer
Explain why magnesium oxide does not conduct electricity when solid but does when molten. [2 marks]
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