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To rank these measurements, we take a look at the prefixes of each measurement. These are called the SI prefixes. They are used to form decimal multiples of SI units to avoid very large and very small values of number. The ranking is: 

1Gg
1kg
100g
1dg
1cg
50cg
50 million ng

Answer:

Order from  largest to smallest :

: 1 Gg > 1 kg> 100 g >50 cg > 1 dg > 50 million ng > 1 cg

Explanation:

g = grams

1) kg = kilo grams

1 kg = 1000 g

2)1 cg = 0.01 g

3) 100 g = 100 g

1 g = 1 g

4) 50 cg

1 cg = 0.01 g

50 cg = 0.5 g

5) 1 dg = 0.1 dg

6) 1 Gg = giga gram

1 Gg = 1,000,000 g

7) 50 million ng = [tex]5\times 10^7 ng[/tex]

[tex]ng = 10^{-9} g[/tex]

50 million ng = [tex]5\times 10^7\times 10^{-9}g = 0.05 g[/tex]

Order from  largest to smallest :

:1,000,000 g > 1000 g > 100 g >0.5 g > 0.1 g > 0.05 g> 0.01 g

: 1 Gg > 1 kg> 100 g >50 cg > 1 dg > 50 million ng > 1 cg

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