The moon rises and sets every day, like the sun. sarah noticed that the moon was sometimes visible at night and sometimes during the day. she noted when she first saw the moon (moon-rise) on two days in april. she looked up the time in the newspaper for moon-set. both were different. why? a) the moon is orbiting the earth once per month. b) the night sky is moving east to west over earth. c) the earth is moving in an opposite direction from the moon. d) the apparent change in position is related to the sun's reflection.

the answer is A.) the moon is orbiting the earth once per month

its the only logical answer, the others are either impossible or illogical

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.