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Atomic Structure and Chemical Bonding — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtomic Structure and Chemical Bonding2 Marks
Question
Write down the electronic configuration of the following:
(a) ${ }_{13}^{27} \mathrm{Y}$
(b) ${ }_{17}^{35} \mathrm{Y}$
✓

Answer

Electronic configuration: ${ }^{27} X _{13}=2,8,3$
Number of electrons in $X =13$
Number of neutrons in $X=27-13=14$
Electronic configuration of ${ }^{35} Y _{17}=2,8,7$
Number of electrons in $Y =17$
Number of neutrons in $Y =35-17=18$

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