1) What is the main purpose of the periodic table? a) To list all the elements in the universe b) To show the number of isotopes each element has c) To organize elements based on their atomic structure and properties d) To calculate the atomic mass of elements 2) Which of the following is NOT a characteristics of isotopes? a) They have the same number of proton b) They have different numbers of neutron c) They have the same atomic number d) They have the same atomic mass 3) What is the difference between an element and compound? a) Elements are made of one type of atom, while compounds are made of two or more different types of atoms b) Elements are made of two or more types of atoms, while compounds are made of one type of atom c) Elements are always gases, while compounds are always solids d) Elements are found in nature, while compounds are made in the lab 4) What is atomic mass? a) The number of protons in an atom b) The number of neutron in an atom c) The total number of protons and neutrons in an atom d) The number of electrons in an atom 5) Which of the following is true about atomic mass? a) It is the same for all isotopes of an element b) It is the average mass of all isotopes of an element c) It is always a whole number d) It is the same as the atomic number

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