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Which two elements have an atomic mass less than twice their atomic number?
Elemental hydrogen and helium have atomic masses less than twice their atomic numbers.
Why those elements does not emit radiation whose atomic number is less than 82?
Elements with atomic numbers less than 82 do not emit radiation because they do not have unstable nuclei. Radioactive decay occurs when an atom has an unstable nucleus, which may be due to an imbalance of protons and neutrons. Elements with atomic numbers greater than 82 are more likely to have unstable isotopes that can undergo radioactive decay.
The atomic mass of iodine is less than the atomic mass?
The atomic mass of iodine is about 126.9 g/mol, which is indeed less than the atomic mass of many other elements. This low atomic mass for iodine is due to its position in the periodic table and the number of protons and neutrons in its nucleus.
Why aren't there many more than 100 occurring elements?
Because scientists just simply add a proton to an element, and they get the next element. For example, of you had one sodium atom (all sodium atoms have an atomic number of 11), and added a proton to it, you would get magnesium atom (all magnesium atoms have an atomic number of 12). So if scientists did this with element 99, they get element 100.
What elements have an atomic mass of less than 10?
Elements with an atomic mass of less than 10 include hydrogen (1.008), helium (4.0026), lithium (6.94), beryllium (9.0122), and boron (10.81). Among these, hydrogen, helium, lithium, and beryllium all have atomic masses below 10, while boron is just above. These elements are primarily found in the first two rows of the periodic table.
Which two elements have an atomic mass less than twice their atomic number?
Elemental hydrogen and helium have atomic masses less than twice their atomic numbers.
Why those elements does not emit radiation whose atomic number is less than 82?
Elements with atomic numbers less than 82 do not emit radiation because they do not have unstable nuclei. Radioactive decay occurs when an atom has an unstable nucleus, which may be due to an imbalance of protons and neutrons. Elements with atomic numbers greater than 82 are more likely to have unstable isotopes that can undergo radioactive decay.
The atomic mass of iodine is less than the atomic mass?
The atomic mass of iodine is about 126.9 g/mol, which is indeed less than the atomic mass of many other elements. This low atomic mass for iodine is due to its position in the periodic table and the number of protons and neutrons in its nucleus.
How many elements under atomic number 101 have names ending with ium?
Well, darling, elements with names ending in "ium" are usually metals, and they're as common as wrinkles on a raisin. But if we're talking about elements with atomic numbers less than 101, then there are 8 elements with names ending in "ium." So, to answer your question, there are 8 elements under atomic number 101 that have names ending with "ium."
How Henry Moseley rearranged the periodic table?
Henry Moseley did a series of experiments looking at the x-ray spectra of various elements. He found that the frequencies of equivalent bands made a very simple progression that more or less corresponded to atomic weight order. The exceptions were exactly the same as the ones where Mendeleev's scheme was having difficulties. He thus arrived at a definition of atomic number, and proposed a revised periodic law where the ordering of elements was according to atomic number rather than atomic weight.
Does Alpha decay results the lighter elements?
Yes, daughter element has atomic number two units less and atomic mass four units less.
What happens to the reactivity of elements in a group labeled A as atomic numbers increase across period?
In a group labeled as A, as atomic numbers increase across a period, the reactivity of elements generally decreases. This is because as you move from left to right across a period, the elements have more protons in the nucleus, which leads to stronger nuclear charge and less tendency to lose electrons and react with other elements.
How are period arranged on the periodic table?
The elements are arranged in order of increasing atomic number in the Periodic Table. The rows are called periods and the columns are called groups.
What happens to the atomic size of the elements as on goes from the top to the bottom of a group?
Atomic size decreases as one moves from bottom to top in a group. The elements get smaller because they have less stuff in them.
Why aren't there many more than 100 occurring elements?
Because scientists just simply add a proton to an element, and they get the next element. For example, of you had one sodium atom (all sodium atoms have an atomic number of 11), and added a proton to it, you would get magnesium atom (all magnesium atoms have an atomic number of 12). So if scientists did this with element 99, they get element 100.
Why do we need atoms?
According to modern Periodic Table Atomic numbers are the fundamentals in order to explain the properties of an atom.One thing more and that is the concept of isotopes also make the atomic masses less strong to explain atomic properties which has no effect on atomic numbers.
Why do you need atomic numbers?
It tells you how many protons an atom of an element has. It is the basis of the arranegement of the periodic table and has taken the scientific world a long time to discover. About 1860 C. E. Mendeleyev published the first such table.
