Answer:
Argon ( Ag)
Step-by-step explanation:
The notation "18p 22n" indicates the atomic composition of an element. In this case, it implies an element with 18 protons (p) and 22 neutrons (n). To identify the element, you can look up the element with atomic number 18 on the periodic table. Element 18 is argon (Ar). Therefore, the element with 18 protons and 22 neutrons is argon.