Just as we saw in the periodic table, atomic radii vary by group and period. Helium has been found to have among one if not THE smallest size due mainly on two factors: Trends within groups as well vertical movement through periods – meaning more empty space at higher points since there are less layers above us than below, What element has the smallest atomic radius? The closer an electron’s nuclear charge, or effective number density for this property can get towards a nucleus without being repelled by its strong Coulomb force field thus decreasing radii from left-to right and bottom up around Ishikawa’s rule which states “the energy levels increase going upwards.” The atomic radius of helium is shrinking because it trends with other elements in the periodic table. Which period has the smallest atomic radius? Atomic radius increases as you go to left and downward due to attraction of electrons for a nucleus in an atom which is why it’s found at higher levels on Earth than others like neon or Argon gas that can’t hold its own against such strong pull from outer space! Which element in Period 2 has the smallest atomic radius?įluorine is the element with smallest atomic radii.

It is clear that the element with most mass in Period 2 is Ne, which has an atomic number of 10 and a molecular weight of 21.08 g/mol – or Z=10 to put it another way! Which elements have the largest atomic radius?įrancium has the largest, Helium has lowest.

Which element in Period 2 has the largest atomic mass? The element in the second period that has the largest atomic radius is the Lithium (Li). General Trend – (largest) – → What element in the second period has the largest atomic radius? Nuclear Charge (charge on all protons) – 3+ – 4+ Energy Level being filled (Valence Shell) – second (L) – second (L)

Smallest atomic radius