Question

multiple choice question
if two elements are side by side on the periodic table, how does the element to the right compare?

• its atomic mass is always one unit greater.
• its atomic number is always one unit greater.
• it has one more electron energy level.

Explanation:

The periodic table is arranged in order of increasing atomic number. Adjacent elements (side - by - side) have an atomic number difference of 1. Atomic mass is not always one unit greater as it depends on the number of neutrons and protons, and adjacent elements do not have an extra electron energy level as they are in the same period.

Answer:

Its atomic number is always one unit greater.