Which quantity identifies an element?
1. atomic number
2. mass number
3. total number of neutrons in an atom of the element
4. total number of valence electrons in an atom of the element

Enzymes affect the reactions in living cells by changing the

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never

Which factor is likely to impact the possible number of compounds? presence of unlimited number of elements in the periodic table the inability of atoms to align perfectly with other atoms the ability of all elements to react with every other element all elements being equally reactive