Answer:
Single covalent bonds that form between nuclei are created from the "head-to-head" overlap of orbitals and are called sigma (s) bonds. This overlap may involve s-s, s-p, s-d or even p-d orbitals. Another type of bond, a pi (p) bond is formed when two p orbitals overlap.
Explanation:
In a face centered cubic unit cell, the volume occupied by the particles of the substance is about 74% of the total unit cell. First, we find the volume of a single atom assuming it to be sphere:
Volume(atom) = 4/3 x π x r³
Volume(atom) = 4/3 x π x (197 x 10⁻¹²)³
Volume(atom) = 2.87 x 10⁻²⁹ m³
There are a total of 4 atoms in a FCC unit cell, so the total volume occupied by atoms is:
2.87 x 10⁻²⁹ x 4
= 1.15 x 10⁻²⁸ m³
Volume of cell = (1.15 x 10⁻²⁸ ) / 0.74
Volume of cell = 1.55 x 10⁻²⁸ m³
Answer:
λ = 1*10⁻¹⁰m
Explanation:
Frequency (f) = 3.0*10¹²MHz = 3.0*10¹⁸Hz
Speed (v) = 3.0*10⁸m/s
Speed (v) of a wave = frequency (f) * wavelength (λ)
V = fλ
Solve for λ,
λ = v / f
λ = 3.0*10⁸ / 3.0*10¹⁸
λ = 1*10⁻¹⁰m
λ = 0.
Combustion is an example of "Potential" to "Kinetic" energy conversion.
<span>This question has the following options:
A.The two electrons in one orbital must have opposite spin.
B.The two electrons in one orbital must have the same spin.
C.The two electrons in one orbital can have either opposite or the same spin.
D.The two electrons in one orbital repel each other if they have opposite spin.
E.The two electrons in one orbital attract each other if they have the same spin.
The correct answer to this item is letter A. Two electrons in one orbital must have opposite spin. This means that when one electron is assigned to have an up-spin, then the other must have a down-spin.</span>