I think sulphate is answer.
Well most gases are lighter then metals:D
Answer:
C) philosophical and intuitive speculation
Explanation:
Hi
Leucippus and Democritus proposed the concept of an atom based on philosophical speculation as a way of explaining reality with the scarcity of data available at that time.
The ideas of Leucippus and Democritus were rejected at that time but later retaken by Dalton when proposing his atomic model.
Success with your homework.
The element that has a complete valence electron shell is argon (Ar) since it is a noble gas in the last group on the periodic table.
Answer:
1037.56 mph
Explanation:
We are told the distance around the earth which is the circumference is 40075 km.
Converting to miles gives 24901.451 miles
Formula for speed = distance/time
Time for one rotation is 24 hours.
Thus, speed = 24901.451/24 = 1037.56 mph
