The majority of an atoms' mass comes from the protons and neutrons that make up its nucleus.
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Answer:</h3>
12 neutrons
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Explanation:</h3>
- A neutral atom is an atom that has no charge, which means it has no additional electrons or electrons removed from its energy levels.
- An atom is made up of sub-atomic particles neutrons and protons found in the nucleus and electrons found in the energy levels.
- The number of protons in the nucleus of a neutral atom is known as the atomic number.
- In a neutral atom, the atomic number is equal to the number of electrons as protons are equal to the number of electrons.
- The sum of protons and neutrons in the nucleus of an atom is known as the mass number of an atom.
Therefore;
Protons = Atomic number
Protons + neutrons = Mass number
Thus;
Neutrons = Mass number - protons or
= Mass number - atomic number
In this case;
Atomic number = 11
Mass number = 23
Thus;
Neutrons = mass number - atomic number
= 23 - 11
= 12 neutrons
The answer is 0.25 g/cm3
The equation for finding density is mass divided by volume.
Therefore,
12 grams/ 49 cm3= 0.24489795918367 gram/cubic centimeter
you would then round this to the nearest significant figure which is the number of significant numbers you have and the highest amount of sig figs present in this equation is two sig figs. That means that you would round your answer, becasue it has a zero before the decimal which doesn't count as a significant figure, to the nearest hundredth which would be 0.25 and then you add your value after it which is g/cm3
I'm pretty sure it's A, but then again I'm only in 8th grade. Sorry if this doesn't help:(
Answer:
Explanation:
Kindly note that I have attached the complete question as an attachment.
Here, we are told that elimination occurs by an E2 mechanism. What this means is that the hydrogen and the halogen must be above and below for the reaction to proceed.
The possible products are as follows;
Please check attachment for complete equations and diagrams of compounds too.
