Which of the following is the electron configuration of the iron(II) ion (Fe²⁺)?

Which is the correct formula for copper(II) sulfate?

Calculate the energy required to excite a hydrogen atom from n = 1 to n = 4.

The electron configuration of a ground-state Co atom is:

Which pair is isoelectronic?

How many unpaired electrons does an atom of nitrogen have in its ground state?

In the following diagram of a wave                      

The straight-chain hydrocarbon that contains ten carbon atoms is:

How many orbitals are allowed in a subshell if l = 0?

Complete the following chart, in order from left to right Ion Mass Number Protons Neutrons Electrons  ⁵⁶Fe³⁺