1. a) How many protons, neutrons and electrons are there in ⁵²₂₄Cr ⁶⁺?

b) Give the electron configuration of ¹⁴ Si and list the quantum numbers of the two highest energy electrons.

c) In acidic medium balance the following equation: As₂O₃ + MnO₄^- H₃AsO₄ + Mn²⁺

d) Give the Lewis electron structure of chloroform (CHCl₃) molecule and define the molecular structure by VSEPR method. (₁₇Cl)

Atomic weights: H=1, C=12, O=16, g/mol