The half life of uranium 230 isotope is 20.8 that is one half of a given amount of uranium 230 decomposes every 20.8 days. How much of an initial amount of 1000 grams of the isotope will be left after 208 days?

there is no image attacted

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.

it would open into a square depending on the type of envelope i’m not sure about the second part