Question

question 9 (1 point)
why are noble gases frequently found unreacted?
they have a full outer shell.
they do not need to react to become stable.
they are monatomic.
noble gases have enough valence electrons.
all of the above are true.
question 10 (1 point)
which of the following atoms will lose an electron most readily?
calcium
strontium
rubidium
potassium
question 11 (1 point)
which of the following molecules is known for not bonding?

Explanation:

Question 9

Noble gases have a full outer shell of electrons (usually 8, except for helium which has 2). This full outer shell makes them very stable. Since they are already stable, they do not need to react (either by gaining, losing, or sharing electrons) to achieve a more stable electron configuration. Also, noble gases are monatomic (exist as single atoms) because they do not need to bond with other atoms to become stable. Having a full outer shell means they have enough valence electrons (8 for most, 2 for He) to be stable.

Ionization energy (the energy required to remove an electron from an atom) decreases down a group and increases across a period. Calcium (Ca) and strontium (Sr) are in Group 2 (alkaline earth metals), while rubidium (Rb) and potassium (K) are in Group 1 (alkali metals). Alkali metals have a lower ionization energy than alkaline earth metals in the same period because alkali metals have one valence electron which is easier to remove compared to the two valence electrons of alkaline earth metals. Among Rb and K, Rb is below K in Group 1. As we move down a group, the atomic radius increases, and the outermost electron is further from the nucleus and is less tightly held. So, rubidium has a lower ionization energy than potassium.

Noble gas molecules (such as He, Ne, Ar, etc.) are known for not bonding (or having very low reactivity) because they have a full outer shell of electrons and are stable. Without seeing the specific options for Question 11 (assuming it's similar to noble - gas - related molecules), if one of the options is a noble gas molecule (e.g., He, Ne, Ar), that would be the answer.

Answer:

All of the above are true.

Question 10