1) Spur Gear-Parallel and co-planer shafts connected by gears are called spur gears. The arrangement is called spur gearing. Spur gears have straight teeth and are parallel to the axis of the wheel. Spur gears are the most common type of gears. The advantages of spur gears are their simplicity in design, economy of manufacture and maintenance, and absence of end thrust.
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Nitrogen is an anomaly and does not follow the general trend for affinity, as it has an extremely low/not stable value for its first electron affinity, due to its orbital stability (p 3). Electron affinity is defined as the amount of energy released when an atom gains an electron in order to for a negative anion. This is an exothermic process, and therefore the data values included in the simulation are denoted with a negative (-) sign.