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Champ Jee
Subject: Science
, asked on 8/2/18
List any two properties of the elements belonging to first group of modern periodic table.
Answer
3
Harini
Subject: Science
, asked on 7/2/18
why can't noble gases be acomodated in the newlands periodic table , even though mendeleev's table could acomodate noble gases although it did not leave space for it ???
Answer
3
Saswat Das
Subject: Science
, asked on 6/2/18
The position of three elements A, B and C in the periodic table is shown below:
Giving reasons explain:
(a) Element A is a metal.
(b) Element B has larger atomic size than the element C.
(c) Element C has a valency of one.
Answer
2
R J
Subject: Science
, asked on 1/2/18
Q. 24. (a) What is the difference between resistor and the resistance?
(b) What is the direction of current sent by a cell in a circuit?
Answer
3
R J
Subject: Science
, asked on 1/2/18
Q. A person suffering from an eye-defect use lenses of power - 1 D. Identify the eye defect .Draw a suitable to illustrate how this type of lens corrects the defect Give the nature of corrective lens to be used . Also , calculate the focal length of corrective lens.
Q. With the help of a labelled diagram explain why sun appears reddish at the sunrise and sunset ?
Answer
2
Jwell
Subject: Science
, asked on 27/1/18
how may we write the answers of written question based paper ? In the supervision of authorities?
Answer
2
Mahdi Reza Vakil
Subject: Science
, asked on 26/1/18
Mendeleev's Periodic Table published in German Journal in 1862 (ref: NCERT textbook pg 83 / grade 10 ) states that Hydrides and Oxides formed by an element were treated as one of the basic properties for classification of elements. Please explain how Hydrides were given formula as R
2
O, RO, R
2
O
3
, RO
2
, R
2
O
5
, etc and Oxides as RH, RH
2
, RH
3
, RH
4
etc. Hope I am able to convey my query?
Answer
3
Champ Jee
Subject: Science
, asked on 25/1/18
The position of three elements in the periodic table is given below-
Group 16
Group 17
------
------
------
X
------
Y
------
Z
(a) State whether Z is metal or nonmetal.
(b) Will Z be larger or smaller than Y?
(c) Which type of ion will be formed by the element Z?
(d) Will Z have smaller or larger ionization energy than Y?
Answer
2
Champ Jee
Subject: Science
, asked on 25/1/18
What is ionisation energy?
Which of these has maximum ionisation energy- Na, Mg, Al, Cl, Ar.
Answer
1
Champ Jee
Subject: Science
, asked on 25/1/18
Describe briefly the long form of the periodic table (5 marks)
Answer
4
Champ Jee
Subject: Science
, asked on 25/1/18
Argon has atomic number 18 and belongs to third period and zero group. Predict the group and period for the elements having atomic 17 and 19 respectively.
Answer
2
Champ Jee
Subject: Science
, asked on 25/1/18
Name two elements whose atoms are readily converted to unipositive ions.
Answer
1
Nimesh R
Subject: Science
, asked on 22/1/18
Where do you think should hydrogen be placed in the Mordern Periodic Table ?
Answer
4
Nimesh R
Subject: Science
, asked on 22/1/18
Why is hydrogen placed in group 1 and period 1 in the modern period table near the metal ?
Answer
4
Harsh
Subject: Science
, asked on 22/1/18
Answer the given question with proper steps.
Q.16. The following table shows the position of six elements A, B, C, D, E and F in the periodic table.
Using the above table answer the following questions :
(a) Which element will form only covalent compunds?
Answer
2
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What are you looking for?
Giving reasons explain:
(a) Element A is a metal.
(b) Element B has larger atomic size than the element C.
(c) Element C has a valency of one.
(b) What is the direction of current sent by a cell in a circuit?
Q. With the help of a labelled diagram explain why sun appears reddish at the sunrise and sunset ?
------
------
X
Y
------
Z
(a) State whether Z is metal or nonmetal.
(b) Will Z be larger or smaller than Y?
(c) Which type of ion will be formed by the element Z?
(d) Will Z have smaller or larger ionization energy than Y?
Which of these has maximum ionisation energy- Na, Mg, Al, Cl, Ar.
Q.16. The following table shows the position of six elements A, B, C, D, E and F in the periodic table.
Using the above table answer the following questions :
(a) Which element will form only covalent compunds?