idk if this is an answer but this is what i found in my book. atomic raduis increases down a group and decreases across a period
The atomic number of Selenium is 34.
Barium has a radius (not raduis) which is almost twice as large as that of silicon.
Fluorine has the smallest atomic radius, while Francium has the largest atomic radius.
The noble gas with the smallest atomic number is helium, with an atomic number of 2.
It is He.
boron
Bromine has a larger radius (not raduis) than chlorine.
The element with the smallest atomic radius among Ge, Se, Br, and As is Arsenic (As). Atomic size generally decreases across a period from left to right, so the elements in this group progress in order of increasing atomic radius: Germanium (Ge) > Selenium (Se) > Bromine (Br) > Arsenic (As).
Fluorine, as a halogen in Group 7A of the periodic table, has the smallest atomic radius due to its high effective nuclear charge and strong attraction for electrons. This makes the fluorine atom very compact with a small atomic radius compared to other elements in the same group.
Se < O < K < Cs - Atomic radius decreases across a period from left to right on the periodic table, while it increases down a group. Therefore, Se has the smallest atomic radius, followed by O, then K, and Cs has the largest atomic radius.
idk if this is an answer but this is what i found in my book. atomic raduis increases down a group and decreases across a period
The atomic radii of elements follow a general trend: As you move down a group on the periodic table, atomic radius generally increases. Among the three elements mentioned, Se would have the largest atomic radius, followed by Te, with Br having the smallest atomic radius.
The atomic number of Selenium is 34.
Barium has a radius (not raduis) which is almost twice as large as that of silicon.
Hydrogen is a gas element. It had the smallest atomic number.
Argon doesnt have the smallest atomic radius, its chlorine.Argon has the largest atomic radius in period 3.