ICSE Chemistry Class X Important Papers By M. P. Keshari
Chemistry - Periodic Properties and Variation in Properties (Solved)Disable Pop up Blockers to View Solution
Question .1. State the number of elements in Period 1, Period 2 and Period 3 of the Periodic Table.
If an element has one electron in its outermost energy level, then it is likely to
be ________ (metallic/non-metallic).
(i) The properties of the elements are a periodic function of their ___________
(atomic number, mass number, relative atomic mass).
(ii) Moving across a ___________ of the Periodic Table, the elements show
increasing ___________ character (group, period, metallic, non-metallic).
(iii) The elements at the bottom of a group would be expected to show __________
metallic character than the element at the top (less, more).
(iv) The similarities in the properties of a group of elements is because they
have the same __________ (atomic number, electronic configuration,
number outer electrons).
(a) the greatest metallic character?
(b) the largest atomic size?
(i) Write the formula of the sulphate of the element with atomic number 13.
(ii) What type of bonding will be present in the oxide of the element with atomic number 1?
(iii) Which features of the atomic structure accounts for the similarities in the chemical properties of the elements in group 7A of the periodic table?
(iv) Name the elements which has the highest ionization potential.
(v) How many electrons are present in the valency shell of the element with the atomic number 18?
(vi) What is the name given to the energy released when an atom in its isolated gaseous state accepts an electron to form an anion?
(vii) What is the electronic configuration of the element in the third period which gains one electron to change into an anion?
(viii) Fill in the blanks :
The atomic size ________ as we move from left to right across the period, because the
__________ increases but the __________ remains the same.
(i) Arrange the elements in the order in which they occur in the Periodic Table from left to right. (The group 1 element first, followed by the group 2 element and so on, up to group 7.)
(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a ______
lower/higher) electro-negativity than sodium and the element above chlorine would be
xpected to have a _________ (lower/higher) ionization potential than chlorine.
(b) On moving from left to right in a given period, the number of shells (remains the
(c) On moving down a group, the number of valence electrons (remains the same/increases/decreases).
(i) to (v) refer to changes in the properties of elements on moving left to right across a period of the Periodic Table. For each property, choose the letter corresponding to the correct answer from the choices a, b, c and d.
(c) remains the same
(d) depends on the period.
(a) depends on the number of valence electrons
(c) remains the same
(a) goes up and down
(d) remains the same.
(c) remains the same
(d) sometimes increases and sometimes decreases.
(v) The electron affinity of the elements in group 1 to 7:
(a) goes up and then down
(b) decreases and then increases
Li Be B C O F Ne
(i) To which period do these elements belong?
(ii) One element of this period is missing. Which is the missing element and where
(iii) Which one of the elements in this period shows the property of catenation?
(iv) Place the three elements fluorine, beryllium and nitrogen in the order of
(v) Which one of the above elements belongs to the halogen series?
Boron, Aluminium, Gallium, Indium, Thallium.
Answer the following questions in relation to the above group of elements :-
(i) Which element has the most metallic character?
(ii) Which element would be expected to have the highest electro-negativity?
(iii) If the electronic configuration of Aluminium is 2, 8, 3 how many electrons
are there in the outer shell of Thallium?
(iv) The atomic number of boron is 5. Write the chemical formula of the
compound formed when Boron reacts with Chlorine.
(v) Will the elements in the group to the right of this Boron group be more
metallic or less metallic in character? Justify your answer.
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