Question

Which of the following factors contributes to the increase in atomic size within a group in the periodic table as the atomic number increases?

Answer 1

Answer:

These factors are: The number of protons in the nucleus (called the nuclear charge). The number of energy levels holding electrons (and the number of electrons in the outer energy level). The number of electrons held between the nucleus and its outermost electrons (called the shielding effect).

Answer 2

The following factors contribute to the increase in atomic size within a group in the periodic table as the atomic number increases:

• Moving Down the Periodic Table. The principal energy levels hold electrons at increasing radii from the nucleus. Therefore, atomic size, or radius, increases as one moves down a group in the periodic table.
• The atomic number equals the number of protons in an atom. So the atomic number increases with each element.
• The atomic mass is the sum of the protons and neutrons. As the atomic number increases it causes an increase in the atomic mass.
• When the atomic number increases, this means that there are more protons and neutrons that add to the atomic mass of an atom. The atomic mass for any given atom mainly comes from the mass of the protons and neutrons
• Atomic radii vary in a predictable way across the periodic table. Thus, helium is the smallest element, and francium is the largest.