The mystery first name of a student in the class does not begin with a, b, c, d, e, or f. the names first letter comes before s, t, u, v, and w. the students whose names start with j, k, l, m, and n are not it. all letters from o through q are not it. x, y, z and g, h, i are not it. what is the first letter of the mystery name? explain how you completed the list.

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.