The electron dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom? A) H2S
B) NH3
C) CH4
D)HCN
E) CO2

Explain which atom l or m is more stable and why

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