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//__**Net force:**__//all of the forces combine on a similar object. __**//Noble gas//**:__the group 18 elements that have no reaction to anything
 * //__Nebula:__//**in the interstellar space there is a huge cloud of gas and dust.
 * Online Definition:[|Nebula]
 * [[image:http://farm1.static.flickr.com/113/290934728_f0851b6340_m.jpg width="130" height="129"]]
 * [|Heart of a Nebula by DJMcrady]
 * Online Definition:[|Net force]
 * //__Neutral:__//**a both not being acidic or basic
 * Online Definition:[|Neutral]
 * [[image:http://farm1.static.flickr.com/220/452868113_c43068e9b4_m.jpg width="96" height="128"]]
 * [|Carbon neutral packaging by Oscar the Goat]
 * //__Neutralization reaction:__//**when a acid and a basic solution form together with water and salt.
 * Online Definition:[|Neutralization reaction]
 * **//__Neutron__//**:a particle in the nucleus of an atom that has no charge.
 * Online Definition:[|Neutral]
 * [[image:http://farm1.static.flickr.com/111/291708133_37911a8bc3_m.jpg width="155" height="122"]]
 * [|Neutron star 2004 by NASA by Pingnews.com]
 * //__Newton__//:**force is SI unit
 * Online Definition:[|Newton]
 * Online Definition:[|Newton]
 * Online Definition:[|Noble gas]
 * [[image:http://farm1.static.flickr.com/97/213991334_3e335bd22b_m.jpg width="169" height="113"]]
 * [|Noble gas series V3 by Pulpolux !!!]
 * //__Nonmetal__//**:elements on the periodic table that are all the way to the right
 * Online Definition:[|Nonmetal]
 * [[image:http://farm1.static.flickr.com/248/514919252_5f5ce8c97b.jpg?v=0 width="190" height="186"]]
 * [|Mercury gas by Curious Expedition]
 * //__Nucleic acid__//**:the subunits of a molecule that are made of nucleotides
 * Online Definition:[|Nucleic acid]
 * //__Nucleus__//**:the center of a atom made of protons and neutrons positively charged
 * Online Definition:[|Nucleus]
 * [[image:http://farm1.static.flickr.com/220/491406598_e15a69684f_m.jpg width="216" height="180"]]
 * [|Nucleus of Galaxy Centaurus A by Pingnews.com]