What element has 4 valence electrons and is in period 6

True or false an element's reactivity is determined by the number of protons found in an atom of the element

254950m to millimeter

Nuclei of U-238 atoms are (1) stable and spontaneously absorb alpha particles (2) stable and spontaneously emit alpha particles (3) unstable and spontaneously absorb alpha particles (4) unstable and spontaneously emit alpha particles

Name the family that is composed of all gases

1.) Describe specialized feeding structures of parasitic platyhelminths. 2.) Some parasitic flatworms have a very complicated life cycle with more than one host. Infer why this might be adaptive. 3.

Sedimentation is least likely to occur

Why it is important to learn about elements, compound, and mixture?

Sodium borohydride is stable in acidic aqueous solutions. True or False

Assume at exactly 100.0°c and 1.00 atm total pressure, 1.00 mole of liquid water and 1.00 mole of water vapor occupy 18.80 ml and 30.62 l, respectively.

The time it takes to run a kilometer depends on the amount of exercise a person gets. What is the independent variable? -person running -time to run a kilometer -running -the amount of exercise