In the lesson, many models were used to depict the atom. How did these models help you understand atomic structure? my element is Hydrogen.

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas