Answer:
It is necessary for contracting muscles, forming and strengthening bones and teeth, conducting nerve impulses throughout the body, clotting blood, maintaining a normal heartbeat
A total solar eclipse happens when the moon completely hides the solar surface, cutting off all direct rays of sunlight from the the person watching.
Answer:
Size and Mass of the Nucleus
Explanation:
Electrons have virtually no mass, but protons and neutrons have a lot of mass for their size. As a result, the nucleus has virtually all the mass of an atom. Given its great mass and tiny size, the nucleus is very dense.
The sublevel designation=6f
The allowed values of the magnetic quantum number are: ml=−3,−2,−1,0,+1,+2,+3
The number of orbitals=7
How are these calculated?
- We are given values for the principal and orbital angular momentum quantum numbers: n=6 ,l=3
- The value of n tells us the shell number. The value of l tells us the type of atomic orbital, which here is an "f" orbital. Therefore, the subshell (sublevel) designation is:6f
- For this subshell the allowed values of the magnetic quantum number are: ml=−3,−2,−1,0,+1,+2,+3
- Each value of ml represents one orbital that holds two electrons. Therefore, we can conclude that there are seven orbitals present at the "6f" subshell, so it has a degeneracy of seven.
What are quantum numbers?
- Quantum numbers are used to describe where around a nucleus a particular electron can be found.
- In any given atom, each electron can be described by four quantum numbers.
- These are n,l,m1,ms
- The values that each number can be are based on a set of rules.
To know more about quantum numbers, refer:
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All chemical equations show that the total mass of the reaction stays the same.