A. Short Essay (maximum of 3 sentences) 1. Dmitri Mendeleev is often regarded as the Father of the Periodic Table. Would you say that Henry Moseley deserves the recognition more than him? If yes/no, Why? Explain your answer. (Answer this question with your own perspective) 2. Explain why the atomic number is called the "fingerprint" of elements. 3. How would you relate alchemy to synthesis of new elements?

Provide the symbol of the following monoatomic ions, given the number of protons and electrons in each. (Enter your answers in the form X + or - q .) a. 37n protons and 36 electrons b. 7 protons and 10 electrons c. 78 protons and 74 electrons d. 17 protons and 18 electrons

1.) What is the 3rd most prevalent element in the human body (name, not symbol)? 2.) What is the 2nd most prevalent element in soil (name, not symbol)? 3.) What is the name of the next heaviest element in the same family as oxygen? 4.) Give the names of three halogens. 5.) What is the group of elements called that consists of very unreactive gases? 6.) Sublimation is a change from the phase to the phase.

Sulfur is a bright yellow solid at room temperature. It is one of the components in gunpowder, matches, and fireworks. It is added to rubber to make it tougher (vulcanization) and to topical ointments for the treatment of skin disorders. a. What is the molecular formula? b. How many electrons and protons are there in an atom of sulfur? c. Two atoms of sulfur combine with two atoms of chlorine. Is this compound a molecule? What is its name and formula? d. How many neutrons are there in the isotope S-36? e. The naturally occurring isotopes of sulfur, their atomic masses, and abundances are: S-32 :31.97207 amu – 94.93% S-33 : 32.97146 amu – 0.76 % S- 34: 33.96786 amu – 4.29 % S- 36 :35.96708 amu – 0.02 % What is the average atomic mass for sulfur? Show the detailed solution. f. How many atoms are there in 12.55 grams of elemental sulfur (S) ? g. What is the mass of a billion atoms of sulfur? h. Sulfur can combine with oxygen in many different ways. Give five examples of that compound and…