Elements that combine with two hydrogen atoms for octet rule satisfaction are O, N, S, and P. Examples include H2O, NH3, H2S, and PH3, where these nonmetals share electrons with hydrogen.
Elements that combine with two hydrogen atoms to satisfy the octet rule are those that need two electrons to complete their outer shell. These elements are typically found in Group 6A (16) and Group 7A (17) of the periodic table. Therefore, the correct choices are:
a. O (oxygen)
b. N (nitrogen)
c. S (sulfur)
f. P (phosphorus)
These elements can form compounds like H2O, NH3, H2S, and PH3 by sharing electrons with hydrogen.