Which the most abundant metal in the Earth crust?

Answer 1

Depends. What do you consider a metal?

If you're an astronomer, it's oxygen. Chemists will laugh at you for saying this, but astronomers (well, some astronomers) divide the elements into "hydrogen, helium, and everything else, which for short we'll call 'metals'". On the cosmological scale, there's some justification for this, as hydrogen and helium are a lot more abundant in the universe as a whole than anything else.

Even if we exclude oxygen as a clear non-metal (in chemical terms), the next most abundant element is silicon, and it's possible to get into all kinds of arguments over whether silicon is a "metal" or not.

The next one after silicon is aluminium, and most people would agree that aluminium is a metal, though a few might quibble and say it's really a metalloid/semi-metal along with silicon.

After that comes iron, which is the most abundant element in the crust where no one can reasonably make a case that it's anything but a metal.

Answer 2

I,t is Aluminium... Aluminium...

Answer 3

Aluminium. Assuming you meant "metal" in the chemical sense and not the astronomical sense, and that you don't consider silicon a metal. If you meant in the astronomical sense, then oxygen.