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Fofino [41]
3 years ago
10

How many periods does the modern periodic table have?

Chemistry
1 answer:
dusya [7]3 years ago
8 0
There are 7 periods in the modern periodic table

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Lead has a density of 11.3 g/cm3 . what is the volume of a 15.1 g block of lead?
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Hey there:

density = 11.3 g/cm³

mass = 15,1 g

Therefore: 

D = m / V

11.3 = 15.1 / V

V = 15.1 / 11.3

V = 1.336 cm³
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C is the correct awnser
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2 years ago
What is the electronic configuration for K2Cr2O7
dybincka [34]

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Potassium compounds are quite common and are extremely useful for a variety of purposes. Potash and other potassium compounds have been used for centuries in the manufacture of glass products. Today 95% of the potassium compounds gathered in the world is used in the manufacture of fertilizers.

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