Match each element to the number of electrons in its valence shell.

Match Term Definition
Beryllium (Be) A) Three
Carbon (C) B) One
Lithium (Li) C) Two
Boron (B) D) Four

Acurium-245 nucleus is hit with a neutron and changes as shown by the equation. complete the equation by filling in the missing parts. 52

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Areaction in which products can react to re-form reactants is