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Because most elements that have at least one isotope stable against radioactive decay have more than one such isotope. The individual isotopes have integer mass numbers, but the naturally occurring abundances of the various isotopes do not usually have any integral ratios to one another, and the Atomic Mass is a weighted average of the isotope masses.
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How do you write a mathematical formula for figuring out the number of neutrons in an atom if you know the atomic number and the atomic mass?
It's quite simple. It's just the atomic mass minus the atomic number. That's because the atomic number is simply the number of protons and the atomic mass is (almost exactly) the number of protons plus neutrons. Unfortunately there is a complication. The problem is that a particular element can have more than one isotope. Each isotope has the same number of protons, but different numbers of neutrons. This can make the atomic mass a messy number that's not a nice whole number.
What does the mass number tell us about and element?
it tells you how much mass is in that object
What Is Wrong With Cloning?
Definitely. It's not even right to clone any humans.
Why do chemists consider periodic table as so useful?
It is useful so they can create more scientific elements Chemists consider the periodic table useful is because it gives information to the atomic number, the average atomic mass, The chemical symbol, a general knowledge to valence electrons, basic knowledge that can be used to determine ions, the ability to determine metals, halogens, noble gases, alkalines, nonmetals, etc and this is all just at arm reach.
What is the number under the element called?
you d and some nice cum to drink
How do you write a mathematical formula for figuring out the number of neutrons in an atom if you know the atomic number and the atomic mass?
It's quite simple. It's just the atomic mass minus the atomic number. That's because the atomic number is simply the number of protons and the atomic mass is (almost exactly) the number of protons plus neutrons. Unfortunately there is a complication. The problem is that a particular element can have more than one isotope. Each isotope has the same number of protons, but different numbers of neutrons. This can make the atomic mass a messy number that's not a nice whole number.
What element has 11 protons and 12 neutrons and 11 electrons?
An atom with 11 electrons (and, presumably, 11 protons) has the atomic number of 11: sodium (Na). With 11 protons and 12 neutrons, its molecular weight is 23 -- the most common atomic mass of Na. It is also a metal, as it appears in the 1A column of the periodic table.
What does the mass number tell us about and element?
it tells you how much mass is in that object
What is Madison pettis real iPhone number?
i know but not going to tell u not even haters so if u want her number just be nice to her so put ur commets below be nice to her
What element has a n atomic mass of 365?
This element does not exist, the mass is far too high and would need about 140-170 protons (and electrons!) to 'keep' it together.Number 107 could have a mass of about 265 but a measured value couldn't be found in extended periodic tables.According to wikipedia http://en.wikipedia.org/wiki/File:Island-of-Stability.png- a nice picture of probability on 'ever finding' isotopes, there is an 'island of stability', in the middle of which number 126 (with isotopic mass 310 and 322) is the most probable to stay long enough to be detected. However it is still far from known how to synthesize this element.
You have no friends How do you make some?
You be nice. Even if there is someone you want to be friends with, you cant just be nice to them. You havta be nice to everyone else EVEN MEANIES!
Where can one find nice women tops for parties?
There are a ton of women's clothing stores where you can find nice tops. JcPenney, Kohls, Younkers, Gordmans, etc are all places that carry really nice women clothing. You can even find nice clothes at mass retailers such as Walmart and Target these days.
How do you get this nice and sweet popular guy to even look at you?
If he is nice, just talk to him.
What is the connotation of odd?
even, or nice and good
What is the density of a metal pipe?
Well, first you need to gather more information. Density= Mass/Volume, so you will need to find the mass in grams of this metal pipe and then calculate the volume. I am assuming that the pipe is going to be a nice even cylinder, so use the circular cylinder volume formula. Then, divide mass/volume, and your answer will be in g/cm3.
Why did the first apple computer cost 414.80pounds?
The price of the Apple I was $666 which was selected arbitrarily as a "nice sounding number" with no meaning or even relation to cost to make.
Is 22 a nice number?
Yess?
