(a)
Interpretation:
The
Concept Introduction:
The atomic number represents the number of electrons revolving around the nucleus in an atom. It also represents the number of protons in the nucleus of an atom.
The elements which belong to Group 1 of the periodic table are known as alkali metals.
(b)
Interpretation:
The atomic number and symbol of the heaviest noble gas should be determined.
Concept Introduction:
The atomic number represents the number of electrons revolving round the nucleus in an atom. It also represents the number of protons in the nucleus of an atom.
The elements which belong to Group 18 of the periodic table are known as noble gases.
(c)
Interpretation:
The
Concept Introduction:
In the modern periodic table, the vertical columns are known as groups and the horizontal rows are known as periods. The group of an element is determined by the number of its valence electrons and the period of an element is based on the principal quantum number of the valence shell of the element.
Elements with 2 valence electrons belong to Group 2 on the periodic table. These elements are known as alkaline earth metals.
(d)
Interpretation:
The atomic mass and symbol of the halogen with the fewest electrons should be determined.
Concept Introduction:
The electronegative non-metals that belong to Group 7A (17) of the modern periodic table are known as halogens.
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