which of these elements has an electron configuration of kr5s²?\n○ barium\n○ calcium\n○ rubidium\n○ strontium
which of these elements has an electron configuration of kr5s²?\n○ barium\n○ calcium\n○ rubidium\n○ strontium
Answer
Brief Explanations:
The electron - configuration [Kr]5s² means the element has the electron configuration of krypton plus two electrons in the 5s orbital. Krypton has 36 electrons. Adding 2 more electrons gives a total of 38 electrons. The atomic number of an element is equal to the number of electrons in a neutral atom. Strontium (Sr) has an atomic number of 38.
Answer:
strontium