How to balance a chemical equations

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

Astudent completes a titration by adding 12.0 milliliters of naoh(aq) of unknown concentration to 16.0 milliliters of 0.15 m hcl(aq). what is the molar concentration of the naoh(aq)? 1)5.0 m 2)0.20 m 3)0.11 m 4)1.1 m

How many neutrons does an element have if its atomic number is 50 and its mass number is 166