A species ‘X’ contains 20 protons and 18 electrons. (A) species ‘Y’ contains 18 protons and 18 electrons. What are ‘X’ and ‘Y’ respectively ?

A species ‘X’ contains 20 protons and 18 electrons. (A) species �

1.	A species ‘X’ contains 20 protons and 18 electrons. (A) species ‘Y’ contains 18 protons and 18 electrons. What are ‘X’ and ‘Y’ respectively ?
Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/ca-375" style="font-weight:bold;" target="_blank" title="Click to know more about CA">CA</a> and Ar<br/>`Ca^(2+)` and `S^(2-)`<br/>`Ca^(2+)` and `CI^(-)`<br/>`Ca^(2+)` and Ar</p>Solution :(i) X has 20 protons `therefore` <a href="https://interviewquestions.tuteehub.com/tag/atomic-2477" style="font-weight:bold;" target="_blank" title="Click to know more about ATOMIC">ATOMIC</a> number = Z = 20`therefore`The atom is Ca But it has <a href="https://interviewquestions.tuteehub.com/tag/18-278913" style="font-weight:bold;" target="_blank" title="Click to know more about 18">18</a> electrons `therefore` X <a href="https://interviewquestions.tuteehub.com/tag/must-2185568" style="font-weight:bold;" target="_blank" title="Click to know more about MUST">MUST</a> be `Ca^(2+)` <br/> (<a href="https://interviewquestions.tuteehub.com/tag/ii-1036832" style="font-weight:bold;" target="_blank" title="Click to know more about II">II</a>) Y has 18 protons `therefore`atomic number = 18 = Z `therefore` The atom is Ar But no. of electron in it are 18 Y must be A</body></html>