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Marrrta [24]
3 years ago
14

What did henry mosely do?, What did he discover and how it proved that mendeleev's period was valid?

Chemistry
1 answer:
Anettt [7]3 years ago
8 0
Henry Mosely reorganized Mendeleev's periodic table so it would be in order of atomic number (number of protons) instead of in order by atomic mass. (I don't know the answer to the other 2 questions I apologize)
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Explanation:

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Not all elements readily fit in the metal or non metal groupings. These elements are called metalloids. Examine the table below
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3 years ago
What volume will 0.405 g of krypton gas occupy at STP?
Rufina [12.5K]

Answer:

The answer to your question is V = 0.108 L or 108 ml

Explanation:

Data

Volume = ?

mass = 0.405 g

Temperature = 273°K

Pressure = 1 atm

Process

1.- Convert mass of Kr to moles

                  83.8 g of Kr -------------------- 1 mol

                     0.405 g     -------------------  x

                     x = (0.405 x 1) / 83.8

                     x = 0.0048 moles

2.- Use the Ideal gas law to solve this problem

                   PV = nRT

- Solve for V

                      V = nRT / P

- Substitution

                      V = (0.0048)(0.082)(273) / 1

- Simplification

                       V = 0.108 / 1

- Result

                       V = 0.108 L

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4 years ago
What is the chemical formula for Duralumin?
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It is an alloy <span>made of copper, magnesium, manganese, and aluminum.</span>
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