In the noble gasses section. Above neon is helium, which means it has less atomic mass, and is in the same section
Mercury-199 is composed of 80 protons, 119 neutrons, and 80 electrons.
<span>MgO + HCl = MgCl2* + H2*O
To balance an equation, you have to have both the reactants and products side equal.
Mg = 1 Mg = 1
H = 1 H = 2
Cl = 1 Cl = 2
MgO + 2HCl = MgCl2 + H2*O
We added the coefficient 2, so they could balance. </span>
Exothermic reactions release heat the surrounding. So Freezing?
A and D
Density is mass over volume, if mass decreases or volume increases density decreases
