The valence of an element is equal to the number of that an atom of
that element gains, loses, or shares while forming chemical bonds.

The valence of an electron is equal to the number of its group number. If it’s in group number 3, then it has 3 valence electrons.

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.