(a)
Interpretation:
The element sodium has to be classified as noble gas representative element or transition metals and also has to be indicated as metal or non-metal or metalloid.
Concept Introduction:
Metals:
Metals are the elements which are shiny materials and good conductors of heat and electricity. All metals are solids at room temperature except for mercury, which is a liquid.
Non-metals:
Nonmetals are the elements which do not have a shiny appearance and non-metals are generally poor conductors of heat and electricity.
Metalloids:
Metalloids are the elements which have properties intermediate between metals and non-metals. Only seven elements are categorized as metalloids.
Representative elements:
- Representative elements are the chemical elements in the group-1, group-2 and in the groups from 13 to 18. Representative elements are also known as group-A elements or s-block elements and p-block elements or main group elements.
- s-block elements have their valence electrons in the outermost s-orbitals and are in two types as alkali metals and alkaline earth metals. Alkali metals are group-1 whereas alkali earth metals are group-2 elements.
- p-block elements have their valence electrons in the outermost p-orbitals. Almost all the p-block elements are non-metals including some metalloids.
Transition elements:
- Transition elements are chemical elements that have unpaired d electrons at least in a stable cation.
- Transition elements include d block and f block elements.
- Transition elements are in the groups 3 to 12.
(b)
Interpretation:
The element Nitrogen has to be classified as noble gas representative element or transition metals and also has to be indicated as metal or non-metal or metalloid.
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
The element Molybdenum has to be classified as noble gas representative element or transition metals and also has to be indicated as metal or non-metal or metalloid.
Concept Introduction:
Refer to part (a).
(d)
Interpretation:
The element Radium has to be classified as noble gas representative element or transition metals and also has to be indicated as metal or non-metal or metalloid.
Concept Introduction:
Refer to part (a).
(e)
Interpretation:
The element Arsenic has to be classified as noble gas representative element or transition metals and also has to be indicated as metal or non-metal or metalloid.
Concept Introduction:
Refer to part (a).
(f)
Interpretation:
The element Neon has to be classified as, noble gas representative element or transition metals and also has to be indicated as metal or non-metal or metalloid.
Concept Introduction:
Refer to part (a).

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Chapter 10 Solutions
FOUNDATIONS OF COLLEGE CHEM +KNEWTONALTA
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