When a electron moves from higher shell to lower shell ,it releases energy because if it goes to lower shell without releasing energy then it will unable to do that so.as lower electron shells have low energy electrons
A substance is an element if it consists of a single type of atom. A substance is a compound if it is made up of more than one element.
<h3>Elements and compounds</h3>
In chemistry, an element is defined as all pure substances consisting of the same atom. For example, magnesium and potassium metal are all elements because they consist of magnesium and potassium atoms only.
On the other hand, compounds are defined as substances consisting of 2 or more atoms of different elements. For example, sodium chloride consists of atoms of sodium and chlorine. Hence, it is considered to be a compound.
More on elements and compounds can be found here: brainly.com/question/13516179
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➷ It is because it involves experimentation and observation of the pencil dropping from different heights.
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Fats release more energy per gram that proteins. when burned a gram of fat releases 9 calories, while one gram of protein releases about 4 calories. Fats release about twice as much energy per gram than protein. Proteins are essential in numerous body functions and processes so this molecule is not usually metabolized for energy.
