If the frequency of a wave is 0.25 Hz, what is its period? A) 0.25 s
B) 2 s
C) 4 s
D) 4 HZ

Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not