Ablock of metal with a mass of 42.8 g and has side lengths of 4.2 cm, 5.6 cm, and 9.8 cm

Density = 0.186 g/cm^3

Step 1. Calculate the volume of the block

V = lwh = 9.8 cm × 5.6 cm × 4.2 cm = 230 cm^3

Step 2. Calculate the density

Density = mass/volume = 42.8 g/230 cm^3 = 0.186 g/cm^3

(There is no metal with this low a density.)

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explanation:

dasdad

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.