Chemistry
Give reasons for the following:
Occurrence of characteristic properties of elements takes place at definite intervals in the modern periodic table.
Periodic Table
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Answer
After definite intervals of atomic number, similar valence shell electronic configuration occurs. Properties of elements depend upon their electronic configuration. As in the modern periodic table, the elements are arranged in increasing order of their atomic numbers hence we observe the occurrence of characteristic properties of elements at definite intervals.
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Related Questions
With reference to group 1 [IA] of the periodic table – fill in the blanks with the correct word:
The elements are …………… [light/heavy] …………… [metals/non metals] since their atomic size is …………… [large/small]. The energy binding the atoms is …………… [high/low] and hence the elements have …………… [high/low] melting points. The melting points of the elements …………… [increases/decreases] down the subgroup. The electropositive character …………… [increases/decreases] down the subgroup and the elements are strong …………… [reducing/oxidizing] agents. The element with electronic configuration 2, 8, 1 will have …………… [higher/lower] electron affinity and …………… [smaller/larger] atomic size than the element with electronic configuration 2, 1.
Match the elements in column 'X' with the correct group they belong from column 'Y'
X Y 1: Element with atomic number 19 A: Group 18 [0 group] 2: Element with electronic configuration 2 B: Group 16 [VI A] 3: Element with a valency of -2 C: Group 1 [IA] 4: Element 'P' which loses 3 electrons to form a cation D: Group 17 [VII A] 5: Element 'Q' in period-3 which has the highest electron affinity E: Group 13 [III A] Give reasons for the following:
Properties of elements are periodic functions of their atomic numbers and not atomic weights.
Give reasons for the following:
Atomic size of an element depends on the nuclear charge of that element.