If the following elements were to form ions, they would attain the same number of electrons as which noble gas? as , be , o , s , ca , mg , sr

Answer;

As, & Sr [Kr]

Be [He]

O, & Mg [Ne]

S, & Ca [Ar]

ExplanationThe Be+ ion has 2 electrons, just like He. The ions Mg2+ and O2− each has 10 electrons like Ne. The S2− and Ca2+ each has 18 electrons like Ar. The ions As3− and Sr+ each have 36 electrons like Kr.Atoms of elements lose or gain electrons to attain a stable configuration which is equivalent to the configuration of noble gases.When atoms lose or gain electrons they form ions, which are either positively charged or negatively charged. When atoms lose electrons they form positively charged ions while if they gain electrons the form negatively charged ions