Diamagmetic solids . a. both a and d b. have atoms with strongly aligned electrons when placed in a magnetic field c. show very slight magnetic character when placed in a magnetic field d. have atoms with one or more unpaired electrons e. have atoms with randomly oriented magnetic moments

1 a

2 d

3 a

4 c

explanation:

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.