REWARDING BRAINLIEST IF THE ANSWER IS RIGHT Listed below are sets of elements.

Which group contains elements that have the following characteristics:

1) At least one is a metalloid.
2) At least one forms an ion with a charge of -2.
3) At least one is a gas.
4) At least one is a halogen

Your

a. Oxygen, fluorine, and aluminum

b. Silicon, magnesium, neon, iodine

c. Arsenic, oxygen, neon, hydrogen

d. Chlorine, sulfur, and silicon

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.

The answer would be true

Large asteroid and comet impacts. because they can have a huge impact on the environment, such as a loss of land, and crust on the earth with the big holes they produce. on the other hand, volcanic eruptions can also cause change within the environment by producing land, but im actually not quite sure which one would be a better answer, hopefully you read this and didnt just flat out choose the first sentence i have spoken! your welcome~