What to a beryllium ion and a neon atom have in common?

A beryllium ion (Be²⁺) and a neon atom (Ne) both have the same number of electrons, which is ten. This is because the beryllium ion has lost two electrons from its neutral state, which originally has four electrons, while neon is a noble gas with a complete outer electron shell consisting of eight electrons. Consequently, both have the same electron configuration, albeit with different nuclear charges and chemical properties.