valence electron configuration for MONATOMIC ION!!! please explain so I can lear

Question

valence electron configuration for MONATOMIC ION!!! please explain so I can learn and make sure to explain for ions not regular elements please!! [Review Topics ces) Use the References to access important values if needed for this question. Enter the type of subshell affected by the gain or loss of electrons. DO NOT enter the specific subshell. For example If electrons are added to the 3p subshell, enter p If electrons are lost from the 4s and 3d subshells, enter s + d. A. An element with the valence electron configuration 4s would form a monatomic ion with a charge of In order to form this ion, the element will lose/gain)Jelectron(s) from/into the lectron(s) from into the subshell(s) B. If an element with the valence configuration 4s's loses 2 electron(), these electrono) would be removed from the ubshell(s) Submit Answer Retry Entire Group 9 more group attempts remaining

Explanation / Answer

A) it will form a monatomic ion with a charge of -2 .

in order to form this ion , the element will lose 2 electrons from the s subshell

B)

given 4s1 3d5

now it loses 2 electrons

we know that

firstly , the outer electrons are removed

so

the 1st electron is removed from s

and

then 2nd electron is removed from d

so

the answer is s + d

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