Technetium react with oxygen, halogens, oxygen, sulfur, selenium, tellurium, boron, carbon etc. and can form alloys with metals.
Technetium is dissolved in inorganic acids excepting hydrochloric acid.
technetium forms with other elements to make compounds
These elements will not combine chemically.
stability
compound is when two or more elements combine chemically
Elements chemically combine to make molecules.
Compound?
yes
Their chemical composition
Compound
sodium and helium
A mixture.
No. helium is chemically inert and does not combine with other elements.