Number the items to show the most effective and the least effective to use to scratch the mineral to test its hardness. Use number 1 for the most effective and the 4 for the least efective.
Chalk(1)
Fingernail(2)
Steel screw(4)
Paper clip(3)
Am I correct????
Reverse the order. #1 is the most effective to scratch.
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Yes, you are correct! The correct numbering for the items in terms of their effectiveness for testing the hardness of a mineral is as follows:
1. Fingernail
2. Paper clip
3. Chalk
4. Steel screw
The reason for this ordering is that the items are ranked based on their hardness relative to that of a mineral. When testing a mineral's hardness using the Mohs scale, a softer material will be scratched by a harder material. By using different materials to scratch the mineral, you can determine its relative hardness.
In this case, the items are ranked from the most effective (fingernail) to the least effective (steel screw). This means that if a mineral can be scratched by a fingernail, but not by a steel screw, the mineral's hardness is greater than that of a fingernail but less than that of a steel screw.