Carbon-14 is the typical radioisotope used to date materials; however it has limitation to 4 years a scientist who wants to date materials older than 4 years would most likely use
a. uranium- 238
b. rubidium- 91
c. iodine- 131
d. cobalt- 60

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Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.