Which of the following is true about elements? a. elements do not combine to form compounds. b. elements combine to form compounds in nonliving substances but not in organisms. c. elements combine to form compounds in organisms and nonliving substances. d. elements combine to form compounds in organisms but not in nonliving substances.

The statement that is true in this question regarding Element is ( Elements combine to form compounds in organisms and nonliving substances )Elements do combine to form compounds, more than one elements will form a compound, for instance Hydrogen will react with Oxygen so that water can be formed. Elements can combine to form compounds whether in nonliving substances or organisms.Element can be regarded as pure substance which  consist only of atoms with  same numbers of protons in their atomic nuclei. Contrary to  chemical compounds, a chemical elements is one that  cannot be broken down into more  simpler substances using  chemical meansExamples of elements are; Hydrogen, Chlorine, Oxygen.

Therefore, the options that is correct is option C.

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☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts