I will mark brainliest if you are correct Which statement about pure substances and elements is correct?

a
All pure substances are elements.
b
All elements are pure substances.
c
Pure substances cannot be elements.
d
Elements cannot be pure substances.

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

What happens to isotopes that are unstable?