Write an activity to show that different metals have different hardness.
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Metals and Non metals.
Recall that lustre and hardness are physical properties. ... As you must have noticed, materials like coal and pencil lead do not show this ... the activity with various objects in Class VI. Now ... The materials other than metals are not sonorous. ... You can write down the reaction taking place in beaker 'B' in a similar manner.
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There are some metals hard which indicates the presence of covalent bonds. This happens because transition metals have unpaired d-electrons. Higher the number of unpaired electrons present in the transition metals, more is the number of covalent bonds formed by them.
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