A container holds three gases: oxygen, carbon dioxide, and helium. The partial pressures of the three gases are 3.0 atm, 6.0 atm, and 9.0 atm, respectively. What is the total pressure inside the container?​

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

5.6⋅10−^19  j

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