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How did Moseley establish a more accurate periodic table?
Moseley established a more accurate periodic table by arranging elements in order of increasing atomic number rather than atomic mass. This led to the modern periodic table where elements are organized by their atomic number, which reflects the number of protons in their nuclei. This arrangement helped to better predict the properties of elements and fill in gaps in the table.
What elements emit alpha beta and gamma rays?
Alpha particles are emitted by heavy elements like uranium and radium. Beta particles are emitted by elements like strontium and tritium. Gamma rays are emitted by radioactive decay of unstable nuclei across all elements.
What measures the exact frequency of the light emitted when an electron changes levels?
Spectrometer is used to measure the exact frequency of the light emitted when an electron changes levels. It separates the different wavelengths of light to determine their frequencies accurately.
What are Frequencies of light emitted by an element called?
"Spectrogram" is a word used to describe the set of specific characteristic frequencies of light which are emitted by a given chemical element when it is sufficiently excited by heat or by some other means.Alternatively, a scientific technique known as "spectroscopy" can be used to identify the elements in some matter of unknown composition and also the emission spectra of molecules can be used in chemical analysis of substances.Because each element's emission spectrum is unique, the "emission spectrum" of a chemical element or chemical compound can be used to help identify what it is. The "emission spectrum" is the name given to the relative intensity of each frequency of electromagnetic radiation http://www.answers.com/topic/emission-spectrum by the element's atoms or a compound's molecules when they are returned to a ground state.
What were the elements Bunsen discover?
Robert Bunsen, a German chemist, is known for discovering the elements cesium and rubidium in 1860 by using spectroscopic analysis. These elements were identified using the characteristic spectral lines emitted by their atoms when heated in a Bunsen burner flame.
What do we now know to be the basis for the observations that Henry Moseley made about the pattern of X-ray frequencies emitted from elements?
Henry Moseley's observations regarding the pattern of X-ray frequencies emitted from elements were based on the relationship between the emitted X-ray wavelengths and the atomic number of the elements. He found that each element emits X-rays at specific frequencies that correlate with its atomic number, rather than its atomic mass. This led to the realization that atomic number is a more fundamental property than atomic mass, ultimately leading to the reorganization of the periodic table by atomic number instead of mass. Moseley's work provided a clearer understanding of atomic structure and the periodic law.
What enabled moseley to determine the number of electrons in atoms of particular elements?
Moseley determined the number of electrons in atoms of particular elements through his pioneering work on X-ray spectra. By bombarding elements with high-energy electrons, he observed the frequencies of the emitted X-rays and found that they correlated with the atomic number rather than the atomic mass. This led him to formulate Moseley's Law, which established a relationship between the wavelength of the emitted X-rays and the atomic number, allowing him to identify the number of protons (and thus electrons) in the atoms of the elements.
In what area does Moseley pioneered works in?
Moseley pioneered works in the field of X-ray spectroscopy, particularly in the study of atomic structure and the development of the concept of atomic numbers. His experiments with X-ray emissions led to the formulation of Moseley's Law, which established a systematic relationship between the frequencies of X-rays emitted by elements and their atomic numbers, helping to refine the periodic table. This groundbreaking work significantly advanced the understanding of the arrangement of elements and their properties.
How did Moseley establish a more accurate periodic table?
Moseley established a more accurate periodic table by arranging elements in order of increasing atomic number rather than atomic mass. This led to the modern periodic table where elements are organized by their atomic number, which reflects the number of protons in their nuclei. This arrangement helped to better predict the properties of elements and fill in gaps in the table.
What are the importance and applications of moseley's law?
Moseley's law establishes a relationship between the atomic number of an element and the frequency of the emitted X-ray. This helps in accurately determining the atomic number of unknown elements and confirming the periodicity of the elements in the periodic table. It is widely used in X-ray spectroscopy for elemental analysis in fields such as material science, chemistry, and physics.
What scientist studied x ray spectra of the elements to reveal their periodicity?
The scientist who studied X-ray spectra of the elements to reveal their periodicity was Moseley. Henry Moseley conducted experiments in the early 20th century that demonstrated a systematic relationship between the wavelength of X-rays emitted by elements and their atomic number, rather than their atomic mass. This work provided a clearer understanding of the periodic table and led to the reordering of elements based on atomic number, which is a foundational concept in modern chemistry.
What wavelenghts are used to study star's?
To make a long story short, all of them. Various properties of starts can be studied by measuring the frequencies and corresponding intensities of electromagnetic radiation from a star. Assuming a star is not moving with respect to the Earth (or, put more simply, is moving as fast as the Earth is and in the same direction), the intensities of the wavelengths emitted by the star can be seen from Earth as having a bell curve distribution whose peak corresponds with the star's temperature. However, this bell curve distribution is not perfect. At several specific frequencies, the intensity of emitted light is greatly decreased. The frequencies influenced by this effect and the degree that this effect occurs are dependent on the component elements and corresponding concentrations of these elements. Therefore, by analyzing the frequencies that are "missing" from the electromagnetic spectrum, one can derive the chemical composition of the star. If the star is moving with respect to the Earth, this distribution of light is distorted even more. As a consequence of relativistic physics, the wavelengths of light emitted from the star will appear to have a higher frequency as seen from the Earth than what was emitted if the star is moving toward the Earth (this is called "blue shift", as visible colors appear more blue). Conversely, the Earth will see lower frequencies of light than were originally emitted if the star is moving away from the Earth (this is called "red shift", as visible colors appear more red). However, since the distribution of light emitted from the star has "missing" frequencies, and since the original emitted frequencies are known for these "missing" frequencies (as they correspond with the frequencies emitted by known compounds), the entire distribution of light can be shifted back to its rightful place. Moreover, the amount of this shift is dependent of the relative speed between the Earth and the star; therefore, the star's speed can be determined from the star's light as well.
What frequencies of light does an incandescent gas emit?
An incandescent gas emits a continuous spectrum of light, encompassing a wide range of frequencies. The specific frequencies emitted depend on the composition and temperature of the gas.
What elements emit alpha beta and gamma rays?
Alpha particles are emitted by heavy elements like uranium and radium. Beta particles are emitted by elements like strontium and tritium. Gamma rays are emitted by radioactive decay of unstable nuclei across all elements.
What was The quantum theory of energy levels within atoms was aided by?
The quantum theory of energy levels within atoms was aided by the emission spectrum. When excited with light, different elements emitted photons of different frequencies. The frequencies were different because the energy difference from excited to low energy state was different depending on the element.
What electromagnetic wave have the highest frequencies and the shortest wavelengh?
Gamma rays have the highest frequencies and the shortest wavelengths among all electromagnetic waves. They have the highest energy and are typically emitted from nuclear reactions and some astronomical sources.
What measures the exact frequency of the light emitted when an electron changes levels?
Spectrometer is used to measure the exact frequency of the light emitted when an electron changes levels. It separates the different wavelengths of light to determine their frequencies accurately.
