The structure on the left does not have any resonance contributors in which electrons are. donated to the carbon with the open octet. Compare this with the carbocation that has. resonance and a delocalized positive charge. Charge delocalization imparts stability, so. the structure with resonance is lower in energy.
A numerical expression is a mathematical sentence involving only numbers and one or more operation symbols. Examples of operation symbols are the ones for addition, subtraction, multiplication, and division. They can also be the radical symbol (the square root symbol) or the absolute value symbol.
Algebraic expression. In mathematics, an algebraic expression is an expression built up from integer constants, variables, and the algebraic operations (addition, subtraction, multiplication, division and exponentiation by an exponent that is a rational number). For example, â + is an algebraic expression. Since taking the square root is the same as raising to the power , â + is also an algebraic expression. By contrast, transcendental numbers like Ï and e are not algebraic. A rational expression is an expression that may be rewritten to a rational fraction by using the properties of the arithmetic operations (commutative properties and associative properties of addition and multiplication, distributive property and rules for the operations on the fractions).