Answer:
Keeping in view aufbau principle,
the electronic configuration of atom having highest value of n = 4 will be \[1\,{{s}^{2}}\,2\,{{s}^{2}}\,2{{p}^{6}}\,3\,{{s}^{2}}\,3{{p}^{6}}\,4\,{{s}^{2}}\]\[3\,{{d}^{10}}\,4\,{{p}^{6}}\]
(After 4p, filling of 5s starts)
Hence,
maximum number of electrons present = 36 (Kr).
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