(c)Magnesium nitride is also an ionic compound. Draw a dot-and-cross diagram which shows its formula, the charges on the ions and the arrangement of the valence
electrons around the negative ion.
Use x to represent an electron from a magnesium atom.
Use o to represent an electron from a nitrogen atom.

2. Calculate the percent composition of ammonium nitrate, NH4NO3
.
(Calculate the % by mass of each element in ammonium nitrate.)

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

answer seismograph;