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Which element in row 6 of the periodic table (shown below) has the largest radius?

Which scientist developed the model of the atom pictured below? 

Match the subatomic property with its description: 

At the time of the first French contact with the native Americans, the entire southern half of the modern-day region of Louisiana had not been settled by Native Americans. 

La Salle was successful in first establishing a small fort and settlement in southwest Louisiana in the 1680s. He then quickly abandoned this region and established Fort Maurepas. 

One method for making ethanol, C2H5OH, involves the gas-phase hydration of ethylene, C2H4: Estimate ΔH for this reaction from the given average bond dissociation energies, D.  

How much heat is absorbed when 20.00 g of C(s) reacts in the presence of excess SO2(g) to produce CS2(l) and CO(g) according to the following chemical equation?             5 C(s) + 2 SO2(g) → CS2(l) + 4 CO(g)     ΔH° =  + 239.9 kJ

The neutral atoms of all of the isotopes of the same element have

What are the polarities of the indicated molecules?    SF2      SF6

How many protons does an atom of Copper have?