Hydrogen atoms one outer electron so would be placed in group 1. However all group 1 elements are metals and elements in the same group have similar properties. Hydrogen is a non-metal and does not behave in the same way as the other group 1 elements, so that is why it is on its own.
The part of the atom that accounts for electricity is the electron. As it also determines the properties.
Answer: Electrons
Answer: The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor.
Explanation: