Which of the following is the atomic number of an element in Period 3 on the Periodic Table of the Elements? 4

14

39

49

the answer is 14 because silicon has and atomic number of 14

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

the answer is c. it will give up it's valence electron to the other atom.