Question

In modern periodic table, the properties of elements are a function of their:

• A. atomic size
• B. atomic mass
• C. ionization energy
• D. atomic number

Answer 1

The correct option is D atomic number

In the standard periodic table, the elements are listed in order of increasing atomic number (the number of protons in the nucleus of an atom). A new row (period) is started when a new electron shell has its first electron. Columns (groups) are determined by the electron configuration of the atom; elements with the same number of electrons in a particular subshell fall into the same columns.