Lithium is located in the first group of the periodic table. How many valence electrons does the element lithium have ?

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

In 2002, the rare earth elements mine in mountain pass, california was closed because

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has: