Which electron configuration represents an
atom of chlorine in an excited state?
(1) 2–8–7 (3) 2–8–6–1
(2) 2–8–8 (4) 2–8–7–1

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Do polar molecules have ionic bonds?