Chemistry Periodic Table Exercise5b
Please Select
Q1 a) State the modern Periodic table law.
b) How many periods and groups are there in the modern periodic table
Q2 What are the main characteristics of the last elements in the periods of a periodic table? What is the general name of such elements?
Q3 What is meant in the periodic table by :
(a) a group, and
(b) a period?
Q4 From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table ?
Q5 (a) What are the following groups known as?
(i) Group 1 (ii) Group 17 (iii) Group _18 (b) Name two elements of each group.
Q6 What is the number of elements in the : (a) 1st period, and (b) 3rd period, of the modern periodic table?
Q7 How does the number of i) Valence electrons ii) valency vary on moving from left to right
1.In the second period of a periodic table
2.In the third period of a periodic table
Q8 How do atomic structures (electron arrangement) change in a period with an increase in atomic numbers, moving left to right?
Q9 This question refers to elements of the periodic table with atomic numbers from 3 to 18. In the table below, some elements are shown by letters, even though the letters are not the usual symbols of the elements.
a) Which of these is
i) a noble gas
ii) a halogen
iii) an alkali metal
iv) an element with valency 4
b) If A combines with F, what would be the formula of the resulting compound
c) What is the electronic configuration of G
Q10 Sodium and aluminium have atomic numbers 11 and 13, respectively. They are separated by one element in the periodic table and have valencies I and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.
Q11 Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common.
Q12 In which part of a group would you separately expect the elements to have
(a) the greatest metallic character?
(b) the largest atomic size
Q13 What happens to a number of valence electrons in atoms of elements as we go down a group of the periodic table?
Q14 The position of elements A, B, C, D and E in the periodic table are shown below
(a) State which is metals, non-metals and noble gas in this table.
(b) State which is the most reactive (i) metal (ii) non-metal
(c) Which type of ion will be formed by element A, B and C.
(d) Which is larger in size (i) D or E (ii) B or C.
Q15 Write the electronic configuration of the element .
(a) What is the group number of T?
(b) What is the period number of T?
(c) How many valence electrons are there in an atom of T?
(d) What is the valency of T?
(e) Is it a metal or a non-metal?
(f) State number of protons and neutrons in T.
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