An Iron(II) Ion Has

question 116

Multiple Choice

An iron(II) ion has:

• A) 24 electrons and a charge of 2+
• B) 24 electrons and a charge of 2-
• C) 26 electrons and a charge of 2+
• D) 28 electrons and a charge of 2+
• E) 28 electrons and a charge of 2-

---

Definitions:

T Cell

A type of lymphocyte that plays a central role in cell-mediated immunity, capable of directly killing infected host cells or activating other immune cells.

B Cell

A type of white blood cell that plays a significant role in the immune response by producing antibodies.

Positive Selection

A process in the immune system where developing T-cells are selected for their ability to recognize and bind to self-MHC molecules, crucial for immune response.

Lymphocytes

A type of white blood cell that is integral to the body's immune system, playing roles in both the innate and adaptive immune responses.