Why are metals so strong and hard ?​

Metals are tough because of an effect called plasticity

Explanation:

if you want to know more go to this site

https://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Metals#:~:text=Metals%20are%20tough%20for%20the,This%20effect%20is%20called%20plasticity.

they begin to vibrate harder causing the material that was solid to turn into a liquid i.e gallium or ice

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