Using the ideas from this section and the periodic table, choose the more reactive nonmetal.

p or o

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

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

This drawing shows a human body system. what is the primary function of this body system?