Need this asap, I'll give brainliest. Determine which of the following electron configurations are not valid: State which rule has been violated.

ANSWER

1)4d^10 should be 3d^10

2) 3s^2 is impossible and 3d^5 it should be p not d

3) Ra is not a noble gas

4)Valid

5)Element can’t be its own electron configuration.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.