Question

An element is dull, is poor conductor of heat and electricity and needs one electron to complete its valence shell (outermost energy level). This element most likely belongs to which of the following groups?

Answer 1

Given your question, this chemical element most likely belongs to: C. The halogens, Group 17.

Valence electrons is the number of electrons that is present in the outermost shell (energy level) of an atom.

In Chemistry, valence electrons are used in the following ways:

• To determine the group a particular chemical element belong to on the periodic table.

• To determine whether an atom or group of chemical elements can bond with other chemical elements.

Halogens are chemical elements belonging or found in Group seven (7) of the periodic table. Thus, these group of chemical elements are characterized by the need for a single electron to to complete its valence shell (outermost energy level).

In conclusion, the halogens, Group 7 needs only one electron to fill their valance shell.

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Your question is lacking the necessary answer options, so I will be adding them here:

A. The alkali metals, Group 1

B. The alkali metals, Group 2

C. The halogens, Group 7

D. The halogens, Group 18