Question

Which of the following happens when rubidium forms a ion?

A. It loses an electron and has an octet in the next lowest energy level
B. It loses an electron and has an octet in its inner-most shell
C. It gains an electron and has an octet in the lowest energy level
D. It gains an electron and has an octet in it's outer shell

Answer 1

The correct answer is B.

Step-by-step explanation:

Rubidium is an alkaline metal belonging to group 1A. The energy level of its outer layer contains only one electron. To form an ion, you must lose that electron. This causes your new outer level to be a lower one. In that inner-most shell, the atom has a complete octet of electrons.

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Answer 2

B. It loses an electron and has an octet in its inner-most shell

Step-by-step explanation:

• Rubidium is a metal in the chemical family known as alkali metals.
• Metallic elements form ions known as cation by losing electron(s) from their outermost energy levels to attain an octet configuration.
• Rubidium has one electron in the outermost energy level, and thus, loses the electron to form a cation and forms an octet configuration.
• Like other alkali metals such as potassium and sodium, it forms a cation with a charge of + 1.