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Which of these elements has an electron configuration of [Kr]5s2?
barium
calcium
rubidium
strontium

Sagot :

Rubidium

  • Atomic No-37
  • Short name-Rb
  • Block belongs=s-block.
  • Period=5th period
  • Group=1st group

Answer:

The element that has an electron configuration of [Kr]5s2 is strontium. The rest of the given choices do not answer the question above.

Answer:   D

Explanation: