F = ma One of the most fundamental equations in physics, Newton’s Second Law of Motion, was formulated by Sir Isaac Newton in ...

work out how many atoms of each element are in the chemical formula add together the A r values for all the atoms of each element ...

if you know the relative mass formula (M r) of the compound. Add up the atomic masses of the atoms in the empirical formula. The empirical formula of a hydrocarbon is CH 2 and its M r is 42.

Atomic number 6, atomic weight 12.01115. Manganese (Mn): Manganese is a brittle, metallic element that exists in the ore of pyrolusite. When making steel, it reacts with sulfur and helps to ...

was less than the atomic mass (average mass of the atom). For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass ...