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Name ____________________________________________ Hour ______________ MYSTERY ELEMENTS Follow the clues to find the atomic number of a mystery element. Write the element’s name in the answer blank. Element 1 1. Add the atomic # of Ni to the atomic # of Pb. 2. Divide by the # of p+ in Na. 3. Subtract the rounded atomic mass of He. Answer Element 2 1. Add the # of p+ in Ca to the # of neutrons in N. 2. Divide by the atomic # of Co. 3. Multiply by the # of e- in Sn. Answer Element 3 1. Add the # of p+ in Ne to the # of p+ in Ar. 2. Divide by the atomic # of He. 3. Multiply by the # of neutrons in Li. 4. Divide by the rounded atomic mass of N. Answer Element 4 1. Multiply the # of e- in Magnesium and the # of p+ of Carbon. 2. Divide by the # of n˚ in oxygen. 3. Multiply by the rounded atomic mass of Boron. Answer Element 5 1. Multiply the atomic # of He by atomic # of Ne. 2. Add the # of e- in Ca. 3. Add the rounded atomic mass of N. 4. Divide by the # of p+ in F. 5. Add the atomic # of Zn. Answer Element 6 1. Add the # of p+ of Cl to the # of p+ of arsenic. 2. Divide by the # of n˚ in Neon. 3. Multiply by the atomic # of Lithium. Answer __________________________ Element 7 1. Add the # of p+ in sulfur to the # of n˚ in Bromine. 2. Subtract the # of p+ in Nitrogen. 3. Divide by the # of e- in Fluorine. 4. Add the # of p+ in gold. 5. Subtract the # of p+ in Lithium. Answer _________________________ 1. 2. 3. 4. 5. 6. 7. Element 8 *Extra Credit* Add the # of p+ in iodine to the atomic # of iron. Subtract the # of n˚ in Lithium. Divide by the atomic # of the element that has the symbol of our state. Add the atomic # of the element that sounds like it would make Superman weak. Add the # of p+ of the element found in bananas. Add the # of e- from the element with a ½ life of 1602 years, discovered by Marie Curie. Subtract the atomic # of the only liquid metal at room temperature. Answer __________________________ Name ____________________________________________ Hour ______________ Ch. 3 Book Assignment- The Atom The word atom comes from the Greek word meaning what? _______________________ Ancient Greeks, like ______________________________ and _______________________ hypothesized about the atom, but were unable to run experiments on it. What does the law of conservation of mass state? After looking at a summary of John Dalton’s 1808 Atomic Theory, which 2 statements are not true? (Continue reading ‘Modern Atomic Theory’ if you’re not sure) Define atom. What is the nucleus? Should it have a positive or negative charge? List 3 subatomic particles: __________________________________________ Who discovered electrons? __________________________________ Who discovered the mass of an electron? __________________________ Who discovered the nucleus? _________________________________ What are the forces called in the nucleus that hold the protons and neutrons together, even though like charges should repel? ______________________________ Define atomic number. Define isotope (p. 76) Isotopes have a different number of which subatomic particle? __________________ Because isotopes have different numbers of _____________________, they have different _____________________. How could you find the mass number of an element? ___________ + ____________ Uranium-238 contains ___________ protons and ___________ neutrons. What does a mole measure in chemistry? (p. 81) __________________________________ Avogadro’s number rounded is: ____________________________