The tail of a comet always points away from the Sun.
The tail of a comet always points away from the Sun. This is due to the interaction between the Sun's radiation and the comet's gas and dust particles. As the comet gets closer to the Sun, the solar radiation causes the ice within the comet to vaporize and release gas and dust particles, forming a glowing tail that always faces away from the Sun.
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Answer:
Lead
Explanation:
One that I know is lead.
Isotopes refer to different forms of the same element having identical number of protons but varying number of neutrons. Examples of isotopes with equal number of protons and neutrons include Carbon-12 and Deuterium. These isotopes, including the unstable ones termed as 'radioactive isotopes', contribute significantly to an element's atomic mass.
Isotopes are alternate forms of the same element that have the same number of protons but a different number of neutrons. When an isotope has the same number of protons and neutrons, it can be found in lighter elements such as carbon and hydrogen. A good example is the isotope Carbon-12 (with six protons and six neutrons) which is a common isotope of carbon found on Earth. Another example is Hydrogen-2 or Deuterium (with one proton and one neutron). This is because the number of protons (also known as the atomic number) identifies an element - regardless of the number of neutrons.
The presence of isotopes is important in elements as they contribute to the overall atomic mass and affect the behavior of the element. For instance, radioactive isotopes, such as Carbon-14, are unstable and can emit subatomic particles or energy to attain a lower potential energy state, which explains why they're used in radioactive dating methods.
It's worth noting that the number of neutrons in an atom can vary and is not necessarily equal to the number of protons, especially in heavier elements.
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Answer:
lithium chloride
Explanation:
Li=Lithium
Cl=Chlorine
The correct name for LiCl is Lithium Chloride. It's an ionic compound composed of Lithium and Chloride ions, arranged in a lattice structure with Chloride ions contacting each other across diagonally on the face of a unit cell.
The correct name for LiCl is simply Lithium Chloride. This is an ionic compound, which means it is composed of two ions: the lithium ion (Li+) and the chloride ion (Cl-). In this case, Li (Lithium) loses an electron and becomes a cation (Li+), whereas Cl (Chlorine) gains that electron and becomes an anion (Cl-). The compound LiCl is then formed from the electrostatic attraction between these ions.
On the face of a LiCl unit cell, Chloride ions contact each other across the diagonal of the face, showing the close packing arrangement of the ions in the lattice structure of the compound.
It's worth noting that the common naming system for these types of compounds is quite straightforward. The name of the positive ion (the cation) comes first (Lithium), followed by the name of the negative ion (the anion) with an -ide suffix (Chloride).
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The early 19th century work of John Dalton, particularly his advancement of atomic theory and the concepts of specific mass ratios in chemical reactions, is considered one of the first major series of events in the study of chemistry. Amedeo Avogadro further developed these ideas by defining Avogadro's number.
The origin of chemistry can be traced back to the practice of alchemy, with attempts to understand the behavior of matter dating back more than 2500 years. However, one of the first series of significant events in the
study of chemistry began in the early 19th century with John Dalton's work in atomic theory, which was based on quantitative measurements and helped establish the concept of atoms and molecules as fundamental units of substances. Dalton was also instrumental in establishing the concept of specific mass ratios in chemical reactions, which led to the development of formula mass - the sum of the average atomic masses of all atoms in a substance's formula. This work was later extended by the Italian physicist
Amedeo Avogadro, who developed the concept of a fixed number of atoms or molecules in a mole, known today as Avogadro's number.
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