Relative abundance and atomic mass of the naturally occurring isotopes of hafnium: 5 % - 176 amu
19% -177 amu
27% 178 amu
14% - 179 amu
35% -180 amu
What is the average atomic mass of hafnium?
A)
176 amu
B)
177 amu
179 amu
D)
180 amu

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

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