If the heat of combustion of hydrogen is -285.8KJ, what is the heat of formation of water​

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

Which of the following units is not an official si unit

What causes most sediment to wash or fall into a river