2 x 10^5 standard notation

200,000

Step-by-step explanation:

Following the mathematic PEMDAS rule (Parentheses, Exponents, Multiplication, Division, Subtraction) a rule where it gives the order in an algebraic expression/equation shall be completed. in this case, exponents first which equals 100,000 and that times 2 is doubled to 200,000.

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.