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Stronger Metallic bond or Covalent Bond?

TymfAfterDeath

1

I'm playing with havoc whether Covalent bond is stronger than metallic bond or vice-versa ?

Reply 1

jadakiss

depends if youre talking giant covalent eg diamond, then yes its bonding is stronger than metalic.

if youre talking simple covalent, i'd say metallic bonding is stronger.

Reply 2

Aaron_1507

11

all depend on the what the metallic bonding was in e.g. Na is weaker than Mg.

Reply 3

TymfAfterDeath

OP

1

When I revised GP IV elements,there it's written in book that covalent bond in between the compounds is greater than metallic bond.Also,we know melting point decreases on descending the group.

Reply 4

G O D I V A

11

It depends on the Group, the period and the metals you're comparing.

Going down group 1/2 the metallic bonding decreases, but going across period 4 the metallic bonding increases.

Covalent bonding going down group 7 increases (though this isnt due to covalent bonding as such), but decreases going across period 4 (Si to Cl) due to giant macromolecular, then simple covalent

Reply 5

TymfAfterDeath

OP

1

G O D I V A

It depends on the Group, the period and the metals you're comparing.

Going down group 1/2 the metallic bonding decreases, but going across period 4 the metallic bonding increases.

Covalent bonding going down group 7 increases (though this isnt due to covalent bonding as such), but decreases going across period 4 (Si to Cl) due to giant macromolecular, then simple covalent

I hope u would give better explanation if the above ones is not within the discussion.

Reply 6

G O D I V A

11

TymfAfterDeath

I hope u would give better explanation if the above ones is not within the discussion.

What do you mean

Reply 7

shengoc

12

TymfAfterDeath

When I revised GP IV elements,there it's written in book that covalent bond in between the compounds is greater than metallic bond.Also,we know melting point decreases on descending the group.

Yes, because as mentioned before, the strength of the bonds depend on the structure of the compound/molecule. Group IV elements usually exist as giant molecular structure, take for example Carbon(diamond is giant tetrahedral and graphite is made of lots of hexagonal planes), similar to silicon too, as the idea of periodicity applies here.

Metallic bonds are strong, but again, when compared with giant molecular structure like diamond, it'd be much lesser or somehow similar, depending on the metallic characters present in the metals itself. You can't exactly specify the pattern arbitrarily, i think.

Reply 8

charco

Study Forum Helper

18

The strength fo a covalent bond depends on the atoms being bonded. Likewise metallic, ionic etc.

I suppose the best way to compare would be to look at the enthalpy of atomisation for elements and pick a strong metal and compare it with a strong giant covalent.

Diamond 713 kJ mol-1
Tungsten 837 kJ mol-1

So the tungsten structure has stronger forces holding it together.

Of course you could argue that the bonding in tungsten is non directional and one atoms is held to 12 nearest neighbours, whereas in diamond it is held to only four. This would make the force less between atoms of tungsten than between atoms of carbon.

You decide..

Reply 9

TymfAfterDeath

OP

1

thx for ur kind help.

Stronger Metallic bond or Covalent Bond?

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