Answer:
The period number tells which is the highest energy level occupied by the electrons.
Explanation:
- The period number (denoted by n) is the outer energy level that is occupied by electrons in an atom.
- The period number that an element is in, is the number of energy levels that the element has.
- When we move across a period from left to right in a periodic table the number of electrons in atoms increases within the same orbit.
Answer:
See explanation
Explanation:
In this case, we have to know where we have to do. We have to remove a "Br" and put a methyl group and for this, we need to use a Gilman reaction. (See figure 1). We have to start with <u>bromomethane</u> that reacts with Li to form <u>methyllithium</u>. Then we have to do the reaction with Copper to obtain the Gilman reagent <u>dimethylcopper</u>. Finally, we have to do the reaction with the halide <u>1-bromocyclohexene</u> to form <u>1-methylcyclohexene</u>.
See figure 1
I hope it helps!
Answer: Fluorine (see explanation)
Explanation:
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Answer: The energy of a photon with a wavelength of 820 nm is .
Explanation:
Given : Wavelength = 820 nm
Convert nm into meter as follows.
The relation between energy and wavelength is as follows.
where,
E = energy
h = Planck's constant =
c = speed of light =
= wavelength
Substitute the values into above formula as follows.
Thus, we can conclude that energy of a photon with a wavelength of 820 nm is .
A. DNA Molecules hope this helps out