One liter of air contains about 0.21 l of oxygen. when filled, the human lungs hold about 6.0 l of air. how much oxygen is in the lungs when they are filled with air? (round off to the nearest hundredths place.)

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 true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

What element breaks down into yttrium-90?