Complete and balance the following equation:

HNO₃ + HCl $$\to$$ NO + Cl₂

Complete and balance the following equations:

Cl₂ + OH^- $$\to$$ Cl^- + ClO^-

Elements of the same mass number but of different atomic numbers are known as ____.

Gamma rays are electromagnetic radiations of wavelengths of 10^-6 to 10^-5 cm