Answer:
The valence electrons of nitrogen in its compounds are all sp³ hybridized orbitals. The formal charge on N is usually -1 for an anion, 0 for a neutral compound, and +1 in cations. A nitrogen atom with a formal charge of -3 would correspond to a nitride ion, N³⁻, which is strongly basic in aqueous solution. Hope this helps...
Explanation:
Brainliest please?
<h3>a) Species change over time; some traits become more common, others less. This process of change is driven by natural selection. The traits that become more common are the ones that are “adaptive” or “increase fitness” (that is, a creature's chances of living longer and producing more offspring).</h3>
hope it helps :-).
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