Plm science

PROGRAMME LEARNINGMATERIALON PERIODIC
CLASSIFICATION OF ELEMENTS
MADE BY-
SAKSHI SHAW
ID- 14162076
B.ED- SCI & EDU

CONTENT ANALYSIS
Attempts of
classification
of elements:
Dobereiners’s
Triads
Newlands’ Law of
Octaves:
Mendeleev's
Periodic
Classification
Modern Periodic
Classification-
accepted till date

CONTENT OBJECTIVE
•STUDENTS WILL BE ABLE TO DEFINE PERIODIC CLASSIFICATION
OF ELEMENTS
•STUDENTS WILL BE ABLE TO UNDERSTAND THE NEED OF
CLASSIFICATION OF ELEMENTS.
•STUDENTS WILL BE ABLE TO ANALYSE THE DISCOVERIES &
EARLYATTEMPTS OF CLASSIFYING ELEMNTS.
•STUDENTS WILL BE ABLE TO DEDUCE THE MERITS & DEMERITS
OF SEVERAL CLASSICAL ATTEMPTS OF CLASSIFICATION OF
ELEMENTS.
•STUDENTS WILL BE ABLE TO ANALYSE THE IMPORTANCE OF
MODERN PERIODIC TABLE OVER OTHER CLASSICAL ATTEMPTS
OF CLASSIFICATION.
•STUDENTS WILL BE ABLE TO DESIGN MODERN PERIODIC TABLE
BASED ON PROPERTIES OF ELEMENTS.
•STUDENTS WILL BE ABLE TO SOLVE PROBLEMS ON PERIODIC
CLASSIFICATION OF PROBLEMS.

DEAR STUDENT, READ THE WRITTEN
DOCUMENT CAREFULLY ; TO UNVEIL THE
SECRET ANSWERS TO QUESTIONS LYING
WITHIN….
CLICK HERE
Q.1 Q.2 Q.3 Q.4 Q.5

Q1- Dobereiners’s Triads was given by Johann Wolfgang
Dobereiners's who was –
(a) Swedish botanist
(b)German chemist
(c) European scientist
(a) French chemist.

PLEASE CLICK HERE & READ THE DOCUMENT
AGAIN.

Q.2- He arranged the elements in order of their :
(a) Increasing atomic mass.
(b)Decreasing atomic mass.
(c) Increasing atomic number.
(d)Decreasing atomic number.

PLEASE CLICK HERE & READ THE
DOCUMENT AGAIN.

Q.3- Identify which group of elements is satisfying
Dobereiners's Triads
1.) Lithium (Li) 7.0 2.Hydrogen (H)1.0
Sodium (Na) 23.0 Sodium (Na) 23.0
Potassium (K) 39.0 Carbon (C) 12.0
(a) 1.
(b) 1 & 2 both.
(c) 2.
(d) none of the above.

Q.4- Dobereiners's Law became obsolete because :
(a) Dobereiners's could find only three such triads (group of
three elements) and he could not even put all the elements
known at that time in his triads.
(b)The rules of Dobereiners's triads could not be applied to the
elements which had very low or high atomic mass.
(c) Due to the advancement of techniques of measuring atomic
mass more correctly .
(d)All of the above.

Q.5-Identify the Dobereiners’s Triads in the table below:
(a) 1,2&3.
(b) 1 & 3.
(c) 3.
(d) 2.
Elements and their Atomic Mass
1. Lithium (Li) 7.0 Sodium (Na) 23.0 Potassium (K) 39.0
2. Nitrogen (N) 14.0 Calcium (Ca) 40.0 Barium (Ba) 137.0
3. Chlorine (Cl) 35.0 Bromine (Br) 80.0 Iodine (I) 127.0

Q.1- In Mendeleev's periodic table Elements are arranged
in the periodic table in the order of :
(a) Decreasing atomic size.
(b)Decreasing atomic number.
(c) Increasing relative atomic masses.
(a) Increasing relative atomic number.

Q.2- The law of Newlands’ Law of Octaves depicts that :
(a) Elements are arranged in the periodic table in the increasing
order of their relative atomic masses.
(b)Groups from I to VII are meant for normal elements and
group VIII is for transition elements.
(c) Any given element will exhibit analogous behavior to the
eighth element following it in the table.
(d)All of the above.

Q.3-The limitation of Newland’s law of octave is that :
(a) Newlands’ Octaves could be valid up to calcium only; as beyond
calcium, elements do not obey the rules of Octaves.
Newlands’ Octaves was valid for lighter elements only.
(b) Every eighth element has similar physical and chemical
properties when they were arranged in increasing order of their
relative masses.
(c) The arrangement of elements in Newlands’ Octave resembles
the musical notes. In musical notes, every eighth note produces
similar sound.
(d) None of the above.

PLEASE CLICK & READ THE
DOCUMENT AGAIN.

Q.4- Fill in the blanks:
Mendeleev arranged all 1. elements; in the
order of their 2. in a tabular
form.
(a) 1. 73 ; 2. increasing atomic number.
(b)1.63 ; 2.increasing relative atomic masses.
(c) 1.42 ; 2. decreasing atomic number.
(d)1.53; 2. decreasing atomic size.

Q.5- Limitation of Mendeleev’s periodic table was
because of :
(a) Mendeleev left some blank spaces in his periodic
table in order to place the elements having similar
properties in the same group.
(b) Mendeleev predicted the discovery of some
elements and named them as eka-boron, eka-
aluminium and eka-silicon.
(c) Position of Hydrogen, Position of Isotopes &
Wrong Order of Elements
(d) Position of Noble gases which were discovered
later:

Q.1- Which of the following statements is not a correct
statement about the trends when going from left to right
across the periods of periodic Table.
(a) The elements become less metallic in nature.
(b) The number of valence electrons increases.
(c) The atoms lose their electrons more easily.
(d) The oxides become more acidic.

Q.2- Element X forms a chloride with the formula XCl2,
which is a solid with a high melting point. X would most likely
be in the same group of the Periodic Table as
(a)Na
(b)Mg
(c) Al
(d) Si

Q.3- An atom has electronic configuration 2, 8, 7.
What is the atomic number of this element?
(a) 27
(b)17
(c) 13
(d)15

Q.4- Which element has two shells, both of which are
completely filled with electrons?
(a) Ne
(b)Cl
(c) Ar
(d)H

Q.5- Which element has the electronic
configuration 2, 8, 2?
(a) Mn
(b) Mg
(c) Al
(d) Bo

FURTHERREADING
VIDEO CLASS
PERIODIC TABLE SONG
ENCYCLOPEDIA
GOOGLE BABA

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