Question

Question #32589

Answer 1

There isn't an element with electron configuration `[Kr]5s^2 4d^7`

Explanation:

There isn't an element with electron configuration `[Kr]5s^2 4d^7`

Technetium (43) is `[Kr]5s^2 4d^5`

Ruthenium (44) is `[Kr]5s^1 4d^7`

Rhodium (45) is `[Kr]5s^1 4d^8`