Question

A. An element with the valence electron configuration 2s2 2p5 would form a monatomic ion with a charge of_____ . In order to form this ion, the element will____ (lose/gain) _____electron(s) from/into the_____ subshell(s).


B. If an element with the valence configuration 4s2 3b6 loses 3 electron(s), these electron(s),would be removed from the ______subshell(s).

Answer 1

A. An element with the valence electron configuration 2s² 2p⁵ would form a monatomic ion with a charge of -1. In order to form this ion, the element will gain (lose/gain) one electron(s) (from/into) into the 2p subshell(s).

Explanation: After gain one electron the atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas (2s²2p⁶).

B. If an element with the valence configuration 4s²3d⁶ loses 3 electron(s), these electron(s), would be removed from the both 4s and 3d subshell(s).

Explanation: Two electrons removed from 4s subshell and one electron removed from 3d subshell.