Question

question 15 1 pts the nucleus of an atom contains electrons protons and electrons protons and neutrons protons protons, neutrons, and electrons question 16 1 pts vertical columns of the periodic table are known as nonmetals groups metals metalloids periods

Explanation:

For Question 15, the nucleus of an atom is made up of protons and neutrons. Electrons orbit around the nucleus. For Question 16, vertical columns in the periodic table are called groups, while horizontal rows are called periods. Non - metals, metals, and metalloids are classifications of elements based on their properties.

Answer:

Question 15: C. protons and neutrons
Question 16: B. groups