Question

In the Periodic Table, what is the relationship between two elements that are placed side-by-side in a row?

A.
The element on the left has one more electron.

B.
The element on the left has one more proton.

C.
The element on the right has one more neutron.

D.
The element on the right has one more proton.

Answer 1

Answer is D. The periodic table rows are arranged by increasing atomic number. The atomic number is decided by how many protons they have.