Write the oxidation number and subshell electronic configuration K, CI and O.

Subshell electronic configuration of sodium?

Complete the subshell electronic configuration of He?

The element Cu with atomic number 29 undergoes chemical reaction to form an ion with oxidation number +2. a) Write down the subshell electronic configuration of this ion? b) Can this element show variable valency? Why? c) Write down the chemical formula of one compound formed when this elemrnt reacts with chlorine (Cl_17)

Write the electronic configuration of Carbon.

Identify the incorrect subshell electronic configuration.

The element Cu with atomic number 29 undergoes chemcial reaction to formation with oxidation number +2: write down the subshell electronic con-figuration of the ion.

Write down subshell electronic configura-tion of Cu^(1+) and Cu^(2+)

Bohr models of atoms A, B, C, are given (Symbols are not real). Write the atomic number, mass number and electronic configuration of the atoms.

Write the subshell electronic configuration of Manganese(Mn).