What is the hardest state of matter?
Solid
What is the name of the gird that contains all elements?
periodic table
What is the least reactive element?
platinum
What is the most reactive element?
pottasium
what is the chemical symbol is 'O'?
Oxygen
What is the most valuable metal?
Gold
What is a property of a non-metal?
heat insulator
What element has the chemical symbol 'MG'?
magnesium
What are ceramics put in to harden?
klin
What has no reaction when mixed with hydrochloric acid?
zinc