What is the difference between 3H and 3H2 and What is the difference between 5Cl and 5Cl2

Terminology. • The key idea is the net movement of electrons ... The sum of O.N. values for the atoms in a molecule ... Assign oxidation numbers and compare. ... (aq) + 3H. 2. (g). • Step 5. Complete the balancing by inspection. 2Al(s) + 3H. 2 ... 2. O(l) b) 2MnO. 4. -(aq) + 10Cl-(aq) + 16H+(aq). 5Cl. 2. (g) + 2Mn2+(aq) + 8H. 2.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6