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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.
How is it possible for two isotopes of different elements to have the same mass?
The atomic mass of an isotope is the sum of protons, neutrons and electrons masses.
What did Johann Dobereiner notice about the atomic mass of the middle element in a triad?
Johann Dobereiner observed that in his triads of elements, the atomic mass of the middle element was approximately the average of the atomic masses of the other two elements in the group. This observation suggested a relationship between the properties of elements and their atomic masses, laying foundational ideas for the development of the periodic table. His work highlighted an early attempt to categorize elements based on their similarities, influencing later chemists in their understanding of element relationships.
What is the law of traid?
A German chemist Dobernier observed relationship between atomic masses of several groups of three elements called traids.In these groups the central or middle element had atomic mass average to the other two elements.
What two elements have the same atomic mass?
Two elements that have the same atomic mass are isotopes of the same element, such as carbon-12 and carbon-14, which are both forms of carbon but differ in the number of neutrons. However, if you're looking for different elements with nearly identical atomic masses, chlorine (atomic mass ~35.45) and argon (atomic mass ~39.95) have values that can sometimes be confused due to their proximity on the periodic table, but they are not equal. In general, elements do not share the exact same atomic mass.
What do the molar masses of any two elements contain the same number of what?
Atoms have atomic weight not molar mass. Any atom-gram has 6,022 141 29(27)×1023 (this is the number of Avogadro) atoms.
Are two atoms of different elements because they have close but different masses?
An element is made up of only one type of atom. Atoms are only different from each other due to their atomic number - which is the number of protons. Different elements may have different relative atomic masses, but it is the differing number of protons in each atom that determines which element it is.
What is an atomic element?
An 'atom' is the smallest unit that ANY element can be divided up into. An 'atom' of silver is the smallest piece of silver that there can be, similarly an 'atom' of oxygen is the smallest bit of oxygen that can be. Thus all elements are made of 'atoms'.
How atomic number better than atomic mass?
No two elements may have the same atomic number. But two elements may have same atomic mass. Hence atomic number is better than atomic mass.
State which two elements from the first 20 elements of the modern periodic table are not arranged in order of increasing atomic mass?
Cobalt and Nickel are the two elements from the first 20 elements of the periodic table that are not arranged in order of increasing atomic mass. This is due to the placement of cobalt with a slightly lower atomic mass compared to nickel, which occurs due to the meticulous arrangement of elements based on their chemical properties and not just atomic masses.
Which is the smallest atom magnesium calcium barium or strontium?
Strontium is the smallest atom among magnesium, calcium, barium, and strontium. This is because as you move down a group in the periodic table, atomic size increases due to the addition of more electron shells. Strontium is located lowest in the group 2 elements, so it has the smallest atomic size among the four elements listed.
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.
