Explanation:
sodium atom is neutral while sodium ion is a charged specie with a charge of +1
F BLOCK is the block on the period table that contains the actinide series of elements.
Actinide series of elements are two rows under the periodic table which include Lanthanide series and Actinide series. These are all radioactive elements and all of these are not not found in nature. All these are included in F block element.
Answer:

Explanation:
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In this case, according to the given information, it turns out possible for us to calculate the volume of the new solution by using the general formula of dilution:

In such a way, we solve for the final volume, V2, to obtain:

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Answer:
SHE IS INSULATING THE WIRE SO THAT NO ONE GETS SHOCKED IF THEY ACCIDENTALLY TOUCH IT
D. Cell membrane: surrounds a cell and allows substances to pass in and out