A compound is two or more chemically combined elements. Fore example NaCl, CO2, H2O
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Answer is (3) both mass number and atomic number.
The notation is ₅₅¹³⁷Cs. The Cs represents the chemical symbol of Caesium element. The subscript number at the left hand side of the symbol indicates the atomic number. Hence, atomic number of Cs is 55. The superscript number at the left hand side of the symbol shows the mass number. Hence, the mass number of the Cs is 137.
The answer is D. A compound
The best answer to your question would be B:those who could not be broken down by physical means.
