#1: carbon has different isotopes. what is different between an atom of 12c and an atom of 13c?

a. number of protons in the nucleus

b. number of neutrons in the nucleus

c. number of electrons in the atom

d. number of protons and electrons in the atom

Describe the forces both attractive and repulsive that occur as two atoms move closer together.

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°

Find the missing probability in the table below a.0.10 b.40 c.0.80 d. 0.20