How do you find the-atomic numberatomic an element?

The atomic number is underlined in blue and the atomic mass is underlined in red. The number of protons and electrons is equal to the atomic number. The neutrons is equal to the atomic mass minus atomic number. The group is the vertical column the element is located in (circled in greenish), while the period is the horizontal row (circles in orange).

It changes food into energy that the organism can use.