Argon is the atom that has the smallest radius in Period 3. As you go cross Period 3 from left to right, the atomic radii of the elements decrease. The elements in Period 3 from left to right begin with sodium and ends with argon.
The smallest Vander Waal radius is 120 pm for hydrogen.
Ruthenium (Ru) has the smallest atomic radius in period 5 - 130 pm.
the smallest atom in period 3
Agron
Argon
Argon
Neon :)
In terms of atomic radius, the sequence would be oxygen, carbon (both period 2), magnesium (period 3), rubidium (period 4), and cesium (period 5). Note that order by periods is not absolute: in each period, the elements toward the far left side have the largest radii. For example, the radius for lithium in period 2 is larger than almost all of the elements in periods 3 and 4. *Numerically, the elements O, C, Mg, Rb, and Cs have respective radii of about 60, 70, 150, 235, and 260 picometers.
Your question is incorrect. It should be increases rather than decreases. Well it is the proton number (Z) that increases.
Because as you go down the group the atomic number increase. And by that the number of electrons in the electron cloud increases, thus widening the atomic radii. ***************2nd Opinion**************** If that were true, then atomic radius would also increase as you move to the right in a series. The reason atomic radius increases going down a family is that each atom has electrons in a whole new energy level compared to the atom above it. For example, Group 1: The outer shells are 1s, 2s, 3s, 4s, 5s, 6s, 7s.
Rhodium data: - group 9 - period 5 - atomic number 45
Atomic number 53, column 17, and period 5.
The atomic radius decrease, with several exceptions in periods 6 and 5.
In terms of atomic radius, the sequence would be oxygen, carbon (both period 2), magnesium (period 3), rubidium (period 4), and cesium (period 5). Note that order by periods is not absolute: in each period, the elements toward the far left side have the largest radii. For example, the radius for lithium in period 2 is larger than almost all of the elements in periods 3 and 4. *Numerically, the elements O, C, Mg, Rb, and Cs have respective radii of about 60, 70, 150, 235, and 260 picometers.
Your question is incorrect. It should be increases rather than decreases. Well it is the proton number (Z) that increases.
Period 5 with the atomic number of 38.
The atomic radius of cobalt is about 135 pm (±5 pm).
Because as you go down the group the atomic number increase. And by that the number of electrons in the electron cloud increases, thus widening the atomic radii. ***************2nd Opinion**************** If that were true, then atomic radius would also increase as you move to the right in a series. The reason atomic radius increases going down a family is that each atom has electrons in a whole new energy level compared to the atom above it. For example, Group 1: The outer shells are 1s, 2s, 3s, 4s, 5s, 6s, 7s.
Zirconium(Zr) has an atomic number of 40. It is in Group 4 and Period 5.
Bromine, because Bromine has an atomic mass of only 5.
We can find Polonium as a non metal element. Atomic number of it is 84.
Dubnium atomic number 105
Rhodium data: - group 9 - period 5 - atomic number 45
Atomic number 53, column 17, and period 5.