For example the elements from the first two groups are easily combined with halogens; or noble gases are very unreactive, etc.
Yes.
Elements combine to form chemical compounds.
because the elements can combine in many different ways and thus there are nearly unlimited possible compounds.
When elements and compounds combine to form new compounds the reaction is described in a chemical equation.
Yes, yttrium can combine with other elements to form compounds. Yttrium is a transition metal in the periodic table and has a valence electron configuration that allows it to form chemical bonds with other elements. It can form various compounds, such as yttrium oxide (Y2O3) and yttrium chloride (YCl3).
He said that compounds are formed when atoms of different elements combine
Elements combine to form compounds to become more stable
compounds
yes
yeah it is
Compounds are pure substances formed when two or more different elements combine.
No. Elements are not made of compounds. Elements may be combined to form compounds.