Question

18 multiple choice 1 point
group 17 elements are known as the...
○ boron family.
○ halogens.
○ alkali metals.
○ alkaline earth metals.
clear my selection
19 multiple choice 1 point
calcium would have its largest leap in ionization energy between which two energies?
○ third and fourth ionization energies
○ first and second ionization energies
○ second and third ionization energies
○ fourth and fifth ionization energies
clear my selection

Explanation:

Question 18

Group 17 elements in the periodic table are known as halogens. The boron family is Group 13, alkali metals are Group 1, and alkaline earth metals are Group 2. So the correct option is the one labeled "halogens".

Calcium (Ca) has an electron configuration of $[Ar] 4s^2$. The first two ionization energies remove the 4s electrons. The third ionization energy would require removing an electron from the stable $Ar$ core, leading to a large jump between the second and third ionization energies.

Answer:

B. halogens

Question 19