Why was becquerel’s experiment a first step in discovering radioactivity? a-it showed that a substance could phosphoresce when it was not exposed to light. b-it showed that the substance that was used by becquerel could phosphoresce. c-it showed that a substance could constantly emit radiation even if it was not exposed to light. d-it showed that a substance emitted radiation when it was exposed to light.

Determine the reaction and balance the following equations urgent due in the morning

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°

Find the missing probability in the table below a.0.10 b.40 c.0.80 d. 0.20