The second ionization energy is the energy required to remove the <u>second </u>electron after a <u>valence</u> one has been removed.
<h3><u>Explanation:</u></h3>
For an element, the first ionization energy is defined as the amount of energy required to remove one electron from the outermost valence shell of a neutral atom. Removing one electron increases the number of protons, making it a 1+ ion.
The nucleus (protons) has more bonding to the electrons with negative charge and thus more energy is required if another electron needs to be removed. This higher energy required to remove second electron from a 1+ ion (after the first one has been removed) is termed as the second ionization energy. Second ionization energy leads to formation of a 2+ ion. Similarly, third ionization energy is higher than second ionization energy.
Answer:
the correct answer is
D.Remaining well-hydrated while exercising is best
Answer:
the image is -38.7 cm from the lens
Explanation:
We use the lens equation which says
where 
is the distance to the object, 
is the distance to the image, and 
is the focal length.
Now, in our case
,
,
;
therefore,
where the negative sign indicates that the image is virtual and on the same side of the lens as the object.
Answer:
how many grams are in one kilogram?
1000 grams are in 1 kilogram, as kilo means a thousand.
so multiply 20 by 1000 to get 20,000.
there are 20,000 grams in 20 kilograms.
