C) Ammonia is added to copper sulphate solution till excess?

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Which other elements contain the same number of outer electrons as sodium

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line