Answer:
Solar energy is essentially the light and heat emitted from the sun
<span>An atom containing an equal number of protons and electrons is electrically neutral, otherwise it has a positive charge if there are fewer electrons (electron deficiency) or negative charge if there are more electrons (electron excess).</span>
Answer choice C. Reduction has its electrons as a reactant.
<h3>Answer:</h3>
Potassium has the largest atomic radius.
<h3>Explanation:</h3>
Using periodic table trends one can easily compare the atomic radii of elements. The trends in atomic radii are as follow,
Trends in Groups:
Moving from top to bottom along the groups the atomic radii increases because as you move from top to bottom the number of shells increases hence, the distance of valence electrons from nucleus also increases and therefore, atomic radius increases.
Trends is Periods:
Moving from left to right along the periods the atomic radii decreases. This is because the number of protons and electrons increases but the the valence shell remain the same hence, causing more nuclear charge and more attraction between the valence electrons and nucleus.
<h3>Result:</h3>
Potassium, Calcium, Cobalt and Nickle all are present in same period. Potassium present at the extreme left will have greater atomic radii of 0.227 nm while Co and Ni at the middle of period will have atomic radii of 0.125 nm each. While, the atomic radius of Calcium next to K is 0.197 nm.
Answer: The formula for this hydrate is
Explanation:
Decomposition of hydrated copper sulphate is given by:

Molar mass of
= 160 g/mol
According to stoichiometry:
(160+18x) g of
decomposes to give 160 g of anhydrous 
Thus 42.75 g of
decomposes to give=
g of anhydrous 


Thus the formula for this hydrate is