Question

.You are given with pieces of iron, copper, aluminium, magnesium and sodium and

directed to perform an activity to verify the hardness of different metals. Pick out the correct

observation(s)​

Answer 1

The correct observation for hardness of metals is: Copper>Aluminium>Magnesium>Sodium

• In general, more the number of valence electrons in an atom, stronger metalic bond is formed by them, and thus harder is the metal.
• Sodium has to be the softest among all as it is an alkali metal and has only 1 electron in its valence shell. It can be easily cut using a knife.
• Magnesium having 2 electrons in its valence shell is harder than sodium.
• Aluminium has 3 electrons in its valence shell.
• Copper has a maximum number of unpaired electrons among all.

Answer 2

Answer:

all metals hard.

Explanation:

thankzz