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Which of Jhon Daltons statements about the atom was proven false because of the discovery of isotopes?
Dalton said that all atoms of one element are identical. they are chemically identical but not identical in mass. he did not know of isotopes, which are chemically identical atoms with different numbers of neutral neutrons. ex: all carbon atoms act the same chemically but some mass at 12, others at 14.
What statement from daltons theory no longer true?
One statement from Dalton's atomic theory that is no longer considered true is that atoms of a given element are identical in mass and properties. We now know that atoms of the same element can have different masses due to the existence of isotopes, which are atoms with the same number of protons but different numbers of neutrons. Additionally, advancements in quantum mechanics and the understanding of atomic structure have revealed that atomic properties can vary significantly, challenging the idea of uniformity among atoms of the same element.
Atomic mass is equivalent to the number of?
The atomic mass is the mass of an atom of that element in AMUs. (Atomic Mass Units)The atomic number, however, is equivalent to the number of protons in an atom of that element.The mass number of an atom is the total number of protons and neutrons in the nucleus of an atom. This is therefore always a whole number. The relative atomic mass of an element is the weighted average of the masses of the isotopes relative to 1/12 of the mass of a carbon-12 atom.It is a weighted average as it takes into account the relative abundances of the different isotopes (atoms of the same element but with different numbers of neutrons) of an element. This number is found in the periodic table.For example chlorine has two isotopes, 35Cl and 37Cl, in the approximate ratio of 3 atoms of 35Cl to 1 atom of 37Cl.The number of protons and neutrons in a 35Cl atom must add up to 35, the mass number. The relative atomic mass of chlorine takes into account both isotopes and is therefore 35.5.
What is the ratio of atoms?
A chemical formula gives the number ratio of the different kinds of atoms present in the compound. This means that the ratios are the same if you count in individual atoms, dozens of atoms, or molecules of atoms.
What are the four states of matter and their properties?
Solid - Atoms in the material are compacted and usually have some sort of crystal structure.Liquid - Atoms less compacted than in a solid, able to freely move around but still held together, mostly through intermolecular forces.Gas - Atoms very spread out, with little interaction between individual atoms.Plasma - A plasma is a gas that is heated to a point where one or more electrons is ripped of the nuclei of the material. Since the ionized nuclei are positive and the electrons negative, they repel each other and separate into polar regions. Plasmas therefore behave somewhat like a gas that has magnetic properties and is a good conductor of electricity.
What is the name for atoms of an element that have different masses?
An atom or element that have different masses are known as isotopes.
What are Atoms that vary in the number of neutrons found in their nuclei called?
Atoms that vary in the number of neutrons found in their nuclei are called isotopes. Isotopes of an element have the same number of protons but different numbers of neutrons, which can lead to variations in their atomic mass.
Isotopes are atoms whose nuclei have the same atomic number bith with different number of?
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons in their nuclei. This results in isotopes having the same chemical properties but different atomic masses.
Isotopes are atoms of the same element that different numbers of?
Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei. This leads to variations in atomic mass for isotopes of the same element.
How can there be two different atoms of iridium?
Isotopes are atoms of the same element with different numbers of neutrons in their nuclei, resulting in different atomic masses. This is how there can be two different atoms of iridium.
What do isotopes and nucleus have in common?
Isotopes and nuclei are both related to atoms. Isotopes are atoms of the same element with different numbers of neutrons in their nuclei. The nucleus is the central part of an atom that contains protons and neutrons.
How do you know the difference between isotopes and an element?
Isotopes are atoms of an element having different number of electrons.
When atoms of the same element have different mass numbers they are known as?
isotopes
What is the meaninq of two isotopes stable and unstable isotopes?
Isotopes are atoms of the same element that have the same number of protons, but different numbers of neutrons, and therefore different masses. Unstable isotopes are radioactive and undergo radioactive decay of their nuclei, while stable isotopes do not undergo radioactive decay.
What does it mean if two atoms are isotopes?
If two atoms are isotopes, it means they have the same number of protons but different numbers of neutrons. Thus, they have the same atomic numbers, but different atomic masses.
What are atoms that only differ from the number of neutrons in their nuclei?
isotopes
What atoms has different masses but the same atomic number?
Isotopes of an element have different masses but the same atomic number. Isotopes have the same number of protons and electrons but different numbers of neutrons in their nuclei.
