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Question 48:
Consider the following elements :
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
Solution :
Li,Na,K : All these elements ar e metals having a valency of 1.
Ca,Sr,Ba: All these elements are metals having a valency of 2.
Cl,Br,I : All these elements are halogens.
Question 49:
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.
(a) Name the element which has taken the place of (i)eka-aluminium, and (ii)eka-silicon
(b) Mention the period/periods of these elements in the modern periodic table.
(c) Write the group/groups of these elements in the modern periodic table.
(d) Classify these elements as metals, non-metals or metalloids.
(e) How many valence electrons are present in the atoms of each of these elements ?
Solution :
(a) (i) Gallium (ii) Germanium.
(b) 4th period .
(c) Gallium: 13th group; Germanium: 14th group .
(d) Gallium: Metal; Germanium: Metalloid .
(e) Gallium: 3 ; Germanium: 4 .
Question 50:
A part of the early classification of elements has been given below :
H Li Be B C N O
F Na Mg A1 Si P S
(a) Which law of classification of elements is illustrated by the above arrangement of elements ?
(b) Name the scientist who proposed such a classification of elements.
(c) Why is such a classification of elements compared with a characteristic of musical scale ?
(d) State one limitation of this classification of elements.
Solution :
(a) Newlands’ law of octaves .
(b) Newlands .
(c) This classification of elements is compared with a characteristic of musical scale because in this classification, the repetition in the properties of elements is just like the repetition of eighth note in an octave of music .
(d) This classification of elements could be applied only up to the element calcium and not beyond that .
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FAQs on Solutions of Periodic Classification Of Elements (Page No - 285) - Chemistry Lakhmir Singh, Class 10 - Extra Documents, Videos & Tests for Class 10
| 1. What is periodic classification of elements? |  |
Ans. Periodic classification of elements is the arrangement of elements in a systematic manner based on their atomic numbers, electronic configurations, and chemical properties. It helps in organizing the elements into groups and periods according to their similarities and trends in properties.
| 2. How many periods are there in the periodic table? | |
Ans. There are a total of seven periods in the periodic table. Each period represents a horizontal row of elements, and the number of elements increases from left to right within each period.
| 3. What are groups in the periodic table? | |
Ans. Groups in the periodic table are the vertical columns that contain elements with similar chemical properties. There are 18 groups in the modern periodic table, and elements in the same group have the same number of valence electrons.
| 4. What is the significance of the periodic table? | |
Ans. The periodic table is significant as it allows scientists to predict the properties of elements based on their position in the table. It helps in understanding the trends in atomic size, ionization energy, electronegativity, and other properties. The periodic table also aids in the identification and classification of elements.
| 5. How are elements arranged within a period in the periodic table? | |
Ans. Elements within a period are arranged in increasing order of their atomic numbers, from left to right. As the atomic number increases, the number of protons and electrons also increases. This arrangement helps in observing the periodic trends in properties as we move across a period.
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