Use Mohs' hardness scale to answer the following question.
Mohs' Hardness Scale
softer
Talc
fingernail
(2.5)
Gypsum
2
Calcite
Fluorite
glass
(5.5)
Apatite
Orthoclase
Quartz
Topaz
8
steel nail
(6.5)
Corundum
9
Diamond
10
harder
A sample can be scratched by glass but not by a fingernail. Which two could be a sample be made of? A. Gypsum B. Fluorite C. Apatite D. Orthoclase

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

Look at the bean data from days 4–6. use these data to explain how natural selection changed the number of dark red walking beans over time. writing part

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.