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Because Tc (technetium) is unstable and radioactive, therefore hard to weigh, which is why the weight is rounded.
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∙ 16y ago
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How many nuetrons does the element sulfur have?
I don't have a periodic table, but round its atomic mass to a whole number and subtract the amount of protons which equal the atomic number. So if the atomic mass is 24 and the atomic number is 12, 24-12=12.- example
Do all isotopes have whole number atomic masses?
The short answer is yes. The long answer is that isotopes have different numbers of neutrons than other isotopes of the same element, so when expressing the mass of an isotope, you don't take an average; you just add the number of neutrons and the number of protons. However, that number is not entirely accurate since the mass of a proton and a neutron are very slightly different. So, if you want to be very exact, then no, the mass of an isotope is not a whole number, but it is very, very close.
How are elements represented on the Periodic Table of Elements?
Every element on the periodic table is made of a number of protons and neutrons in the center with electrons around them. What makes one element different from another is the number of protons it has. The number of protons an element has is equal to that element's number on the periodic table.So, for example, Helium, which is element #2, has two protons. Oxygen, element #8, has 8 protons.The element's number that is also its number of protons is the small whole number located above the element symbol. E.g. 8 is written above O for oxygen. (The larger decimal number below the element symbol is something different, the average mass of the element.)
Why do isotopes on the periodic table have mass numbers that are whole numbers?
This is a great question. Actually before 1961 12C had a different mass than it has today. The mass scale we use is actually relative and before 1961 the mass scale was based on Oxygen so 16O = 16 which was the standard in place since 1906. In the 20's people started to discover oxygen isotopes and the chemists 16O scale was not the same as the physicists 16O scale , so it was decided to settle on Carbon to make both the physicists and chemists happy Check the related link below for the complete history of what happened
Is metallic elements more likely to lose electron than nonmetallic elements?
Yes. Metals always lose electrons and non-metals gain electrons.
What number is the whole number found in the periodic table?
There are two numbers that are included in every element's block on every periodic table. The whole number, which can range from 1 - 118 is the atomic number of that element. The atomic number is the number of protons in the nuclei of the atoms of that element. The second number is the atomic weight and is never a whole number, except for the artificially prepared elements, and then it is a whole number written inside parentheses.There may be other numbers listed as well, depending on the periodic table. All periodic tables have a key as to what everything inside each block represents.
How do you find the atomic mass and the atomic number?
The atomic number is the whole # on the periodic table or the # of protons in an atom. The atomic mass is the # that is not the whole # on the periodic table, or you can multiply the mass of the isotope by its abundance and add the answers together.
What is an element's atomic mass not listed as a whole number on the periodic table?
Few elements have isotopes. their atomic mass is not a whole number.
Why don't the elements on the periodic table have a whole number as their atomic weight?
Elements exist as isotopes in nature. So their atomic weight is not a whole number.
Why is the atomic mass of sulfur listed on the periodic table not a whole number?
The atomic mass given on the periodic table is a weighted average of all the isotopes, weighted by abundance of each isotope
Why the atomic mass numbers listed for elements on the Periodic Table are not whole numbers.?
Why are atomic masses of elements not generally whole numbers? The atomic masses listed on the periodic table are a weighted AVERAGE of an element'sisotopes. ... An element's atomic number is the number of protons in its nucleus. Number of protons specifies atom type.
Does tungsten have a high or low atomic number?
Tungsten (W) has an atomic number of 74. This number is high compared to the whole Periodic Table. There are only 18 more natural elements with a higher number.
How do you find nuetrons in a periodic table?
To find the number of neutrons in an atom, round the mass number to the nearest whole number and subtract the atomic number.
Is the whole periodic table made out of elements?
Yes it is.
Why elements don't have whole numbers?
do you mean the why is the average atomic mass not a whole number? because if that is your question, then the answer is that each element has multipal isotopes and the mass you see on the periodic table is the average of all the isotopes together. So there has to be a decimal on the periodic table of elements
What is the only element in the periodic table of group 1?
Actually group 1 is ALL elements and so is the whole periodic table.
Which number in an element box on the periodic table is the atomic number?
The atomic number is the whole number indicating the number of protons. It is usually directly above or below the element symbol.
