What is the most abundant metalloid in the universe

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.