Advertisements
Advertisements
प्रश्न
F, Cl and Br are the elements each having seven valence electrons. Which of these (i) has the largest atomic radius, (ii) is most reactive? Justify your answer stating reason for each.
उत्तर
(i) F, Cl, Br belong to same group 17. Atomic size increase down the group. This is because new shells are added. Hence, Br has largest atomic radius because it has a shells compared to 3 and 2 in Cl and F respectively.
(ii) F is most reactive due to smaller size, high effective nuclear charge and high electro negativity.
संबंधित प्रश्न
Two elements ‘P’ and ‘Q’ belong to the same period of the modern periodic table and are in Group 1 and Group 2, respectively. Compare their following characteristics in tabular form:-
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic character
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides
An element 'X' belong to 3rd period and group 13 of the Modern Periodic Table.
(a) Determine the valence electrons and the valency of 'X'.
(b) Molecular formula of the compound formed when 'X' reacts with an element 'Y' (atomic number = 8).
(c) Write the name and formula of the compound formed when 'X' combines with chlorine
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?
State the valency of the elements of periods 3 and write the formula of their oxides.
Which element has:
twice as many electrons in its second shell as in its first shell?
On the basis of electronic configuration, how will you identify the first and the last element of a period?
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide.
Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
