Chemistry
Give reasons for the following:
Properties of elements are periodic functions of their atomic numbers and not atomic weights.
Answer
Atomic number of an element is equal to the number of protons (or electrons in case of a neutral atom). Physical and chemical properties of elements depend on the number of electrons and their arrangement. Thus, properties of elements are periodic function of their atomic numbers and not atomic weights.
Related Questions
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:
Occurrence of characteristic properties of elements takes place at definite intervals in the modern periodic table.
Give reasons for the following:
Atomic size of an element depends on the nuclear charge of that element.
Give reasons for the following:
Down a group electronegativity should increase with increase in nuclear charge but it is seen that the electronegativity decreases.