Question

Define the following terms:
(a) Typical or normal elements
(b)transition elements
(c)Halogens
(d)metalloids​

Answer 1

Answer:

typical or normal elements-Their general electronic configuration is ns2np5. Normal elements: Elements belonging to the s- and p-blocks in the periodic table are called the normal elements or main group elements.

transition elements-The transition elements are those elements having a partially filled d or f subshell in any common oxidation state. The term "transition elements" most commonly refers to the d-block transition elements. The 2B elements zinc, cadmium and mercury do not strictly meet the defining properties, but are usually included with the transition elements because of their similar properties. The f-block transition elements are sometimes known as "inner transition elements". The first row of them is called the lanthanides or rare earths. The second row consists of the actinides. All of the actinides are radioactive and those above Z=92 are manmade in nuclear reactors or accelerators.

halogens-The halogens are a group in the periodic table consisting of five chemically related elements: Fluorine, Chlorine, Bromine, Iodine (I), and Astatine. The artificially created element 117 may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17.

metaloids- the elements which are both metal and non metal