Question
Show diagramatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
✓
Answer
Atomic number of sodium $(Z) = 11$
Mass number of sodium $(A) = 23$
$\therefore$ Number of protons in the nucleus $= 11$
Number of neutrons in the nucleus $= 23 -11 = 12$
Number of electrons $= 11$
$\therefore$ Electronic configuration of Na atom = $\text{K}\ \ \ \ \text{L}\ \ \ \ \text{M}\\2\ \ \ \ \ 8\ \ \ \ \ 1$
$Na^+$ ion is formed from sodium atom by loss of an electron (present in outer most cell).
Hence, its electronic configuration is $\text{K}\ \ \ \ \text{L}\\2\ \ \ \ \ 8$ however. number of protons and nutrones remains same.
Mass number of sodium $(A) = 23$
$\therefore$ Number of protons in the nucleus $= 11$
Number of neutrons in the nucleus $= 23 -11 = 12$
Number of electrons $= 11$
$\therefore$ Electronic configuration of Na atom = $\text{K}\ \ \ \ \text{L}\ \ \ \ \text{M}\\2\ \ \ \ \ 8\ \ \ \ \ 1$
$Na^+$ ion is formed from sodium atom by loss of an electron (present in outer most cell).
Hence, its electronic configuration is $\text{K}\ \ \ \ \text{L}\\2\ \ \ \ \ 8$ however. number of protons and nutrones remains same.
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