Three type of symbiosis
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Answer:
495 pm (see the relationship between the edge length (a) and radius (r) of atoms in attachment).
Explanation:
A <em>crystalline solid</em><em> possess rigid and long-range order; its atoms, molecules, or ions occupy specific positions</em>. A <em>unit cell</em><em> is the basic repeating structural unit of a crystalline solid</em>. Each sphere in the unit cell represents an atom, ion, or molecule and is called a <em>lattice point</em>. <u>The way the spheres are arranged in layers determines what type of unit cell we have.</u>
In the face-centered cubic cell, there are <u>spheres at the center of each of the six faces of the cube</u>, in addition to the eight corner spheres (see the second picture in the attachment). Each sphere in this arrangement is said to have a coordination number of 12 since each sphere is in contact with six spheres in its own layer, three spheres in the layer above, and three spheres in the layer below. The <em>coordination number</em><em> is defined as the number of atoms (or ions) surrounding an atom (or ion) in a crystal lattice</em>.
In the first picture in the attachment we can see that the relationship between the atomic radius <em>r</em> and the edge length <em>a</em> face-centered cubic cell is:
a=√8*r
Therefore, the edge length will be √8*175 pm = 495 pm
They are converted into a single “o” when "ao" or "oo" are together when naming covalent bonds.
<h3>What is a covalent bond?</h3>A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
Sometimes, while naming the chemical compounds, a problem arises when compounds with “ao” and “oo” are written with -ide name. Conventionally, they are converted into a single “o”.
For example, the “ao” in the dichlorine hept-ao-xide (). This “ao” in the
can be converted into “o”. As the result, the correct name of this compound would be dichlorine hept-o-xide.
Hence, they are converted into a single “o” when "ao" or "oo" are together when naming covalent bonds.
Learn more about the covalent bond here:
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