Your email address will not be published. (ii) Elements that should be in the same group. 10. (ii) K(19) is placed before Ca(20) in the same period (fourth period). Want a call from us give your mobile number below, For any content/service related issues please contact on this number. A) Lithium (c) Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals. (vi) H Question 13. Q2. At the end of Multiple Choice Questions, the answer key has also been provided for your reference. A) Oxygen What is such an arrangement of elements called as? D-5 Road No. CLICK HERE to watch them Introduction In the universe 115 elements have been discovered till today. It has 18 horizontal rows known as Periods, It has 7 vertical columns known as Periods, It has 18 vertical columns known as Groups.
(2013 D) Answer: (a) Na is bigger than …
C) Does not change A) Cl>Si>Al>Mg>Na Write the molecular formula of the compound formed when P and S combine. Two elements of group I are Sodium (Na) and potassium (K). The first classification of elements was into Metals and Non-metals. B) J/mole (v) What would be the ratio of numbr of combining atoms in a compound formed by the combination of element A with carbon? Ionization energy and electro positivity decreases as we move from left to right in periodic table. (d) Ga–3; Ge 4. (ii) Atomic radius increases down the group because number of shells increases on going down the group. A) Be Question 3.
Afraid of a subject or a topic? Noble gases are inert elements. D) zero, Q9- Ionisation energy is measured in - Na, Mg and Al are the elements of the same period of Modern Table having one, two and three valence electrons respectively. (b) A and E belong to the same group as both have the same number of valence electrons, i.e., D) group 16, Q29- An element which is an essential constituent of all organic compounds belongs to ___. (d) Helium (He) Group 18 and Period 1 Group – 2 because it has 2 valence electrons. (ii) Increases. This is because ability to lose electrons increases on moving down the group due to increase in distance between the nucleus and the valence electrons.
(d) How does the valency vary in going down a group? 2. Answer: (i) ‘X’ is in the 2nd group and 4th period of the periodic table. (i) Elements that should be in the same period. long questions & short questions for Class 10 on EduRev as well by searching above. Contact Us. Will it form covalent or ionic compound? C) Metalloids
And so out of all the options, potassium (K) has the largest atomic radii. Vertical columns – Groups The formula will be XCl4. Modern periodic table has 18 vertical columns known as groups. Give any two defect of Mendeleef’s periodic table. C) Mg,Al,Si Answer: They will form ionic bond because X is a metal and Y is a non-metal. A) Atomic mass
Name any two elements of group one and write their electronic configurations. C) Iodine Give one example of such a set of elements. Answer:
Since the atomic radius decreases along a period, the atomic radius of calcium is smaller than that of potassium. Ltd.
What was Dobereiner’s basis of classifying elements? (b) Group-18, 2, 15, 14
Leverage Edu is a one-stop-shop for all your career-related needs - right from finding the best-fit college 91 Springboard, Lotus Building (a) How do you calculate the valency of an element from its electronic configuration? D) None, Q6- Atomic mass is equal to the sum of ____. (b) What is the number of valence elecrtons of F? Upon moving from left to right in the period, the number of shells remains the same. Group—1, 2, 13, 14, 15, 16, 17, 18 respectively. (f) The formula of their chlorides At the end of Multiple Choice Questions, the answer key has also been provided … (i) Within a period of elements, each new electron is added to the same shell. X is most likely to be in the same group of periodic table as -
(e) Determine the valency of these elements. List two observations which posed a challenge to Mendeleev’s Periodic Law. C) Number of Protons Answer the following questions associated with these elements, giving reason in each case : Group 18, the element is Neon. Kindly Sign up for a personalized experience. Save my name, email, and website in this browser for the next time I comment. Learn to explain the properties of elements in the periodic table with our accurate textbook solutions for CBSE Class 10 Chemistry. A) 2 Since phosphorus and Silicon are located at the center, they have the highest number of Valence electrons, and hence are the most unreactive in the period. (b) An element with variable (more than one) valency stored underwater.
For example- Li (6.9), Na (23), K (39). B) Non metals B) nuclear charge on atom He even predicted the properties of these elements by studying the properties of the neighbouring elements. The electronic configuration of P is 2, 8, 8, 2. Andheri East, Mumbai, Maharashtra 400069, Leverage Edu Bangalore,
(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Question 7. B) VIII group Answer: Which of these elements Write the formula of oxide of any of the aforesaid element. Answer: In the following table, six elements A, B, C, D, E and F of the modern periodic table with atomic numbers 3 to 18 are given : (b) It belongs to fourth period and its valency is 1. So it is superior than Mendeleev’s periodic table. (ii) The elements of group I are called alkali metals because they react with water to liberate H, gas and form alkalis. C) zero group
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