Question

write the chemical symbols for three different atoms or atomic anions with 10 electrons.

Explanation:

Step1: Recall noble - gas electron configuration

Neon (Ne) is a noble gas with 10 electrons. Its chemical symbol is Ne.

Step2: Consider anions

Fluorine (F) has 9 electrons. When it gains one electron to form an anion, the fluoride ion ($F^-$) has 10 electrons.

Step3: Consider another anion

Oxygen (O) has 8 electrons. When it gains two electrons to form an anion, the oxide ion ($O^{2 - }$) has 10 electrons.

Answer:

Ne, $F^-$, $O^{2 - }$