Question

an atom has 17 protons, 18 neutrons and 18 electrons. it is most likely the element
o s
o n
o cl
o ca

Explanation:

Step1: Identify element by protons

The atomic number of an element is equal to the number of protons. Here, the atom has 17 protons. Chlorine (Cl) has an atomic number of 17.

Answer:

Cl