Answer:
I think it's streak and cleavage.
Explanation:
I'm not the smartest so sorry if it's wrong.
Boron trifluoride/Molar mass
67.81 g/mol
Explanation:
The most reactive metals are found on the left of the periodic table, in the blue column, known as the alkali metals. Their reactivity increases as we go down column (group) one. Reactive metals, when attached to less reactive metals, have the ability to prevent the less reactive metal from rusting.
1 mole F=19g
2.47 moles F=2.47*19=46.93g
Answer:NASA's Lunar Atmosphere and Dust Environment probe, for instance, orbits the moon and collects information about its atmosphere and surface. This important data can help scientists learn more about moons, asteroids and other objects in the solar system.
Explanation: