List the material required of conducting and experiment to find the focal Length of a concave mirror explain the experimental process also

These models show the electron structures of two different nonmetal elements. which element is likely more reactive, and why? element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table. element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table. element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons. element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

The plum pudding model of the atom states that ?

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.