Chemistry
With reference to the first three periods of the modern periodic table, answer the questions given below.
(a) What features of the atomic structure accounts for the similarities in the chemical properties of the elements in group VII A of the periodic table?
(b) Name the element which has the highest ionisation potential.
(c) What is the atomic number and name of the element present in 3rd period and 17th group of the periodic table?
Periodic Table
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Answer
(a) All elements in group VII A have same number of valence electrons (i.e., 7), hence they have similar chemical properties.
(b) Helium (He) has highest ionisation potential, as it has fully-filled electronic configuration due to which it requires maximum energy to remove an electron from its valence shell.
(c) The element is chlorine (Cl) with atomic number 17.
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