Question

why metals are generally hard​

Answer 1

Answer:Metal have lots of free electrons which create a huge electron pressure (on the order of 100,000 atm), so to crush them,pressures higher than their internal electron gas pressure is required; this is why they are hard.
I hope this will help you

Answer 2

Answer:

Metal have lots of free electrons which create a huge electron pressure (on the order of 100,000 atm), so to crush them,pressures higher than their internal electron gas pressure is required; this is why they are hard.

Explanation:

simple explanation: a metal is hard because it's atoms are close together, forming layers.