Meta Maze Crossword

I can create energy that can be made use of destruction of energy.who am I ?
A poisonous pale yellow gas of the halogen series
I am one of the most non reactive metal available in the earth crust. I am regarded to be the best non corrosive metal even at high temperature
The element on the periodic table that's happy with just two electrons in my single valence shell
I make up about 20% of the air you breath.
A metal abundant found in foods is
Of the four ferromagnetic elements on the periodic table, three are found side-by-side in the transition metals. I am the heaviest of these three.
It is the lightest of the solid alkali metals that floats on water
I am not martensite,but have BCT crystal structure,who am I ?
I appear in grayish white color with the greek name wolfram who am I ?
I am the Period 4 element found in bones and also effective in desulfurization
I am the heaviest metalloid in Period 4.
I find of application in aero industries for manufacturing of aircraft
A strong, hard magnetic silvery-gray metal
I am highest and most ductility of all metals.who I am?
I am an alkaline earth metal that burns with a brilliant white flame.
I am the metal that is solid at room temperature but melts in your hand.
I am the Lanthanide used to make super strong magnets.
The chemical element of atomic number 4
I have five valence electrons and three energy levels.