Question

12 which statement is correct for the atom with the nuclear symbol * (0.5 points) it has 18 protons in its nucleus. it has 10 electrons in its nucleus. it has 8 protons in its nucleus. it has 18 neutrons in its nucleus.

Explanation:

Step1: Recall nuclear - symbol notation

In the nuclear symbol $_{Z}^{A}X$, $A$ is the mass number (number of protons + neutrons) and $Z$ is the atomic number (number of protons). For $_{8}^{18}O$, $A = 18$ and $Z=8$.

Step2: Analyze each option

• Option 1: It has 18 protons in its nucleus. Incorrect, since $Z = 8$ (number of protons).
• Option 2: Electrons are not in the nucleus. Electrons orbit the nucleus.
• Option 3: Since $Z = 8$, it has 8 protons in its nucleus. Correct.
• Option 4: Number of neutrons $N=A - Z=18 - 8 = 10$, not 18.

Answer:

It has 8 protons in its nucleus.