Question

review progress
question 8 of 15
the noble gas is most likely element
choose answer 1. of the four, element
has the
largest atomic radius. the element which would form cations with a 2+ charge is
choose answer 2
choose answer 3
kj/mol
element 1
element 2
element 3
element 4
812
376
503
1037
1862
2234
965
2064
2634
3203
3458
2837
chemistry hkoenig - 02 - 06 (lms)
investigation test: the periodic table (lms graded)

Explanation:

Step1: Recall noble - gas property

Noble gases have full - valence electron shells. They have relatively high first ionization energies. Among the given elements, the one with the highest first ionization energy is likely to be the noble gas. Element 1 has the highest first ionization energy (812 kJ/mol), so it is most likely the noble gas.

Step2: Analyze cation formation

To form a 2+ cation, an element needs to lose two electrons. Elements with relatively low first and second ionization energies and a large jump in the third ionization energy are likely to form 2+ cations. Element 3 has a relatively low first (503 kJ/mol) and second (965 kJ/mol) ionization energy and a large jump to the third (3458 kJ/mol), so it is likely to form a 2+ cation.

Step3: Analyze atomic radius trend

Atomic radius generally decreases across a period and increases down a group. Elements with lower ionization energies are usually larger in size. Element 3 has relatively low ionization energies, so it is likely to have the largest atomic radius.

Answer:

1: Element 1