Select the statements that are correct about a group. the elements in each group have similar chemical properties. the elements in each group have identical physical properties. the atomic number of each element increases by 7 down through the group. each member of the group has the identical electron configuration in the outer shell.

The elements in each group have similar chemical properties.

Explanation:

This is correct because all elements in a group have a similar electron configuration in the outer most shell, therefore they will have similar chemical properties.

Option A as well as Option D are correct statements.

Explanation:

Each member of the group has the identical electron configuration in the outer shell For example VIIA or 17th  group of the periodic table contain Halogens that are Fluorine, Chlorine, Bromine, Iodine and Astatine.

All these elements have same number of valence electrons in its outer shell that is 7.

For example F-9

Cl-17

Hence the general electronic configuration of halogens for the Valence shell is

Because of this reason the elements in a group have similar Chemical properties since electrons play a role in the chemical property of an element.

uranium-238 i believe is your answer

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."