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Question
Chlorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which of these have Physical and Chemical properties resembling chlorine?
Solution
Fluorine and chlorine have atomic numbers 9 and 35, respectively as both are halogens. They belong to the same group 17 and have seven electrons in their valence shell. The valency is 1. Both elements are non-metallic.
RELATED QUESTIONS
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
Name any two elements of group one and write their electronic configurations. What similarity do you observe in their electronic configurations? Write the formula of oxide of any of the aforesaid elements.
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As, C, Hg, Mg, S, Si
Name the element which is in seventeenth group and second period.
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Give examples in support of your answer.
Complete the following sentences
The similarities in the properties of a group of elements are because they have the same …………………
On the basis of electronic configuration, how will you identify the first and the last element of a period?
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(a) State the period and group to which Z belongs
(b) Is Z a metal or a non-metal?
(c) State the formula between Z and hydrogen.
(d) what kind of a compund is this?
Name the elements in Period 1.
Name or state following with reference to the element of the first three periods of the periodic table.
A metal in period 3 having valency 3.
