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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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About how many times longer than modern humans have hooved mammals lived on earth?
abruzzese [7]

Answer:

I think it should be about maybe the times of the dinosaurs

also I think 23 to 16 billion years

Explanation:

No explanation sorry if im wrong

8 0
3 years ago
4.5 centimeters= km<br> please help me girl i’m not trying to fail science
finlep [7]

Answer:

4.5cm = 45/1000000 km

or 4.5cm= 4.5×10^-5 km.

4 0
3 years ago
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Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4? Upper K upper O upper H right arrow upper H
sertanlavr [38]

Answer :

The balanced chemical reaction will be,

H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

The coefficient tell us about that how many molecules or atoms present in the chemical equation.

When sulfuric acid react with potassium hydroxide then it react to give potassium sulfate and water as a product. This reaction is known as acid-base reaction.

The balanced chemical reaction will be,

H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O

4 0
4 years ago
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A sample of gas occupies 9.0 mL at a pressure of 500.0 mm Hg. A new volume of the same sample is at a pressure of 750.0 mm Hg. I
Ymorist [56]
The new pressure is larger than the original, the new volume is smaller than 9.0 ml and the new volume is 6.0 

good luck :D
3 0
3 years ago
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What is the valence charge of Neon
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Are electrons located at the outermost shell of an atom
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