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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.
What else can I help you with?
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 the number under the element called?
you d and some nice cum to drink
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 province in France is Nice in?
France is divided in regions (25 in total) that are themselves divided into departements (100 in total) Nice is in the Provence Alpes Cote d'Azur (PACA) region and in the Alpes Maritimes (number 06) departement
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 characteristic of an element its place on the table?
The characteristic of an element that determines its place on the periodic table is its atomic number, which is the number of protons in the nucleus of its atoms. The elements are arranged on the table in order of increasing atomic number.
What element has 11 protons and 12 neutrons and 11 electrons?
The element with 11 protons is sodium, which is represented by the symbol Na on the periodic table. Since the number of protons determines the element, this element is sodium. The number of neutrons can be calculated by subtracting the atomic number (protons) from the atomic mass (protons + neutrons), so with 11 protons and 12 neutrons, the atomic mass is 23. Sodium typically has 11 electrons to balance the 11 protons, following the principle of charge neutrality in atoms.
What does the mass number tell us about and element?
it tells you how much mass is in that object
Which element has the mass number of 65 with 34 neutron and the charge is 3 plus?
Well, honey, the element you're looking for is Selenium. It has an atomic number of 34, which means it normally has 34 protons and 34 electrons, but with a charge of 3 plus, it means it lost 3 electrons, giving it a net charge of +3. So, there you have it, Selenium with a mass number of 65, neutron count of 31, and a sassy attitude to boot.
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
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!
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.
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
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.
