Select all the options which represent redox reactions. Na + HCI --> NaCl + H2
HCI + NaOH --> NaCl + H2O
CH4 + 02 --> CO2+ H2O
Na + Cl2 --> NaCl

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals