As the elements in group 17 on the periodic table are considered from top to bottom, what happens to the
atomic radius of each successive element and why
does this occur?
A) Atomic radius increases because there are less
electron shells
B) The atomic radius increases because there are
more electron shells
C) The atomic radius decreases because there are
more electron shells
D) The atomic radius decreases because there are
less electron shells

Balance this equation: n2 + h2 > nh3, write the following molar ratios: n2 / n2 / nh3 h2 /

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.