What is 3(nh4)2cl it is for science

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Heat of fusion= heat/mass  heat of fusion = 12.03kj/36 g= 0.3342 kj/g or 334.2 j/g

13 protons and 14 neutrons.  this also means that the amount of electrons also is 13 because electrons have the same amount as protons..the atomic number means the amount of protons (which effectively tells you the electrons) the atomic mass, tells you the amount of protons and neutrons in the nucleus.hope this .