1) We know that only 118 elements exist. a) True b) False 2) The smallest unit of an element is an atom. a) true b) false 3) Gold and Silver are made of atoms. a) true b) false 4) Atoms are the basic building blocks of matter a) true b) false 5) Why is air composed of matter. a) Because there is tons of empty space b) Because oxygen is an element, which is matter c) Because their are colors in matter d) Because you can go through matter 6) There are three basic rules for building an atom. First, the atoms of each type of element are defined by the number of a) Orbital Clouds b) Electrons c) Neutrons d) Protons 7) they have. Second, excluding hydrogen, the number of a) Nucleus b) Neutrons c) Protons d) Electrons 8) is greater than or equal to the number of protons. And third, the number of a) Nucleus b) Neutrons c) Protons d) Electrons 9) The smallest particle of matter is an atom. a) true b) false 10) Protons and electrons are roughly the same size. a) true b) false 11) An oxygen atom contains eight electrons. a) true b) false 12) Atoms are not electrically charged. a) true b) false 13) What does an atom mostly contain? a) nucleus b) empty space c) orbital cloud d) Electrons 14) Where is most of the mass of an atom located? a) nucleus b) Neutrons  c) orbital cloud d) Electrons 15) How many electrons can an orbital hold? a) up to 1 b) up to 2 c) up to 3 d) up to 4 16) A hydrogen atom doesn’t have any neutrons, so why do you think its nucleus does not come apart? a) Because the electrons spin faster b) Because there is a heavy orbital cloud c) Because the nucleus is really big d) Because there is only one proton  17) Matter is made up of a) Elements b) Electrons c) Isotopes d) Protons 18) , and the smallest particles of these are called a) Elements  b) atoms c) Isotopes  d) Orbitals 19) . In turn, the particles are made up of positively charged a) Protons b) Electrons c) Isotopes  d) Nucleus 20) ,neutral a) Electrons b) Isotopes c) Protons d) Neutrons 21) , and negatively charged a) Electrons b) Isotopes c) Protons d) Neutrons 22) Protons and neutrons are located in the nucleus, while electrons are found in the a) Electrons b) Isotopes c) Orbitals d) Nucleus 23) . Atoms that contain the same number of protons but different numbers a) Electrons b) Isotopes c) Orbitals d) Nucleus 24) What are atoms? a) other names for molecules b) The building blocks of nucleus   c) Tiny particles d) The building blocks of Molecules 25) What does the word a’tomos mean in ancient Greece? a) "something that cant be divided any further.” b) "Very small" c) "Unbreakable" d) "To go on forever, infinitely" 26) What is quantum mechanics? a) The study of space b) The study of atoms and small things c) The study of microscopes d) The study of unbreakable things 27) If you wanted to find the chemical element of an atom, you would need to... a) know how many Neutons it has b) know how many orbital paths it has. c) know how many electrons it has. d) know how many Protons it has.

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