Question

Determine how many electrons the ion has: Au+5

Answer 1

$\\ \sf\longmapsto Au^{5+}$

• AU has atomic number 79 .
• It donated 5electrons(5+) .
• Hence it will has 79-5=74electrons

The EC will be

$\\ \sf\longmapsto 1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}4f^{14}5s^25p^3$