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For a given isotope of an element, the "top number" (e.g. 14C or carbon-14) is the Atomic Mass number, the total of neutrons and protons. The bottom number, if displayed, is the atomic number (e.g. 6C all isotopes of carbon have 6 protons). To find the number of neutrons, subtract the atomic number from the isotopes atomic mass number. Here, 14C will have 8 neutrons, and the result is that it is an unstable radioactive isotope. Many stable elements, however, have many more neutrons than protons.

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12y ago
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9y ago

In the usual atomic notation, proton number is on the bottom. The top number is the mass number (protons plus neutrons).

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10y ago

it is the total mass of the element.

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13y ago

the bottom!

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Q: Are protons the number on top or the bottom?
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How do you determine the no of each subatomic particles?

If you use 24He notation then the bottom number in the number of protons and electrons and the top number minus the bottom number is the number of neutrons


What are the top and bottom numbers of carbon-14?

If you mean the 146C, the bottom number (6) indicates the total number of protons. This is always 6 in the case of carbon. The top number is the sum of protons and neutrons, which for this particular isotope is 14 (i.e., carbon-14 has 8 neutrons).


What is the top number what is the bottom number?

If you are asking about the numbers shown on elements the larger of the two numbers is the Mass Number ( the number of protons and neutrons added together) and the smaller number is the Atomic or Proton Number (the number of protons) Top and bottom are also properties of Quarks along with Up & Down and Strange & Charm Science-teacher


What happens to the atomic number as you move down the alkal metal group?

The atomic number increases, because as you move from top to bottom, you are adding protons to the nucleus, and atomic number is the number of protons.


Why the relative atomic mass of an element in th periodic table in fractional form?

The top left number is the mass (neutrons&protons) and the bottom left number is the atomic number(protons)


What are the top and bottom numbers of the isotopic notation for carbon 14?

The top number is 14 and the bottom number is 6. The latter is the same for any isotope of carbon, but the top number changes with the number of neutrons in the isotope, because the top number is the mass number, which is defined to be the sum of the numbers of protons and neutrons.


Is the proton on the top or bottom of the atom?

The protons are at the center of the atom. An atom does not have a top or bottom.


How do you determine protons?

On a periodic table, each symbol has 2 numbers next to it. The top number is the mass number and the bottom number is the proton number.


How many electrons neutrons and protons does Indium have?

So, all you have to look at is at the atomic number of the elements on the periodic table, which it is at the top of the symbol on the P.T, and that is the number of protons and electrons! Now, to find the number of neutrons, you have to find the number at the bottom of the element symbol called the atomic mass no. and you take away that by the top number.


How many nuetrons are on an atom?

it depends on which atom it is but you can figure out the number by looking at the periodic table. for example, sodium Na has an atomic mass of 11 (top no.) and a relative atomic mass of 23 (bottom no.), the top number represents the number of protons (and electrons as they are in equal amount) and the bottom number represent the number of neutrons and protons, so, if you take these away from each other you will be left with the number of neutrons the atom has. hope this helps :)


How do you know the number of protons electrons and neutrons in the 1st 20 elements?

Look at the periodic table.The bottom number on an element is the number of protons. The number of electrons will be the same. Subtract the bottom number from the top number to get the number of neutrons. e.g: 103 Rh 45 Protons= 45 Electrons= 45 Neutrons= 58 (103-45)


On a periodic tableprotons increase?

As you move from left to right on rows, or across periods and top to bottom, or down a group, the number of protons increases.