The element bromine, br, has a larger atomic radius than a) cu, o and ba b) i, cu, and ba c) f and kr d) o, f, and kr

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.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol