Answer: the last option, positive charge occupies a very small volume in the atom.
Explanation:
1) Earlier, JJ Thomson demonstrated that the electrons were subatomic particles and proposed the plum pudding model, in which the electrons are embedded in a positve mass. This model did not explain a lot of facts and was soon replaced.
2) Ernest Rutherford's experiments demonstrated the existence of the atomic nucleus: a tiny region with most of the mass of the atom and the positive charge.
3) Rutherford came up with this conclusion after the amazing results of the gold foil experiment which showed that some α particles (helium nucleii, which have positive charge) bounced off instead of pass through or being slighted deflected.
The bouncing of the α partilces, was infered to be the result of the repulsion by massive positive charge concentrated in small regions, this is the nucleus of the atom.
What is the element in which you are trying to find the number of molecules of?
Answer:
In γ -decay the nucleus changes its state from high to low energy through emission of electromagnetic radiation. Neither atomic number nor mass number change in a γ -decay.
Explanation:
The solution would be like this for this specific problem:
<span><span>Given:
</span>moles of Fe = 31.0 g</span>
So first, we get the molar mass of Fe2O3:
<span>The molar mass of Fe2O3 = 2 x Fe (2 x 55.85) + 3 x O (3 x
16.00) = 159.7 g/mole. <span>
27.4.0 g Fe2O3 x (1 mole Fe2O3 / 159.7 g Fe2O3) = 0.172moles of
Fe2O3
In the formula Fe2O3, there are 2 Fe. So, 1 mole of the
compound Fe2O3 is composed of 2 moles of Fe.
<span>0.172 moles of Fe2O3 x (2 mole Fe / 1 mole Fe2O3) = 0.344
moles of Fe
Therefore, there are 0.344 moles </span></span><span>of fe that are present in 27.4 g of the
compound.</span></span>
Explanation:
<h2>number of moles = </h2>
<h3>thus, number of moles of hydrogen= 11.91/1</h3><h2>=> 11.91</h2>
<h3>number of moles of oxygen= 88.81/32 = 2.77</h3>
<h2>=> 2.77</h2>
hope it helps:)