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Aadi Jain
Subject: Science
, asked on 26/1/18
nemonics for remembering first 20 elements
Answer
1
Annessha Vs
Subject: Science
, asked on 25/1/18
a naturally occuring sample of copper consists of 69.2% of mass number 63 copper is 62.93 and that mass no 65 copper.the relative mass of mass number 63 copper is 62.93 and that mass no 65 copper is 64.93.find the atomic mass of a naturally occuring sample of copper
Answer
1
Vagmi
Subject: Science
, asked on 19/1/18
are the chapters :periodic classification of elements, chemical bonding and chemical reactions included in our syllabus?
Answer
2
S V
Subject: Science
, asked on 16/1/18
Explain J.J Thomson's atomic model and its defects.
Answer
1
Tejas Goyal
Subject: Science
, asked on 14/1/18
Question 24
Answer
2
Tejas Goyal
Subject: Science
, asked on 14/1/18
Q. The relative atomic mass of Boron is 10.84. Calculate the percentage of its isotopes
B
5
10
a
n
d
B
5
11
occurring in nature.
Answer
1
Theodore Delacroix
Subject: Science
, asked on 13/1/18
elements X,Y,Z have valencies
1,2 and 3 respectively . Formula unit masses
of their
oxides are 62,
40,102 respectively If atomic mass of z is divided by thrice the difference in atomic masses
of x and y
then value obtained
is
the atomic number
of which of the following elements
a-carbon,b-
Oxygen,c-
Fluorine,d-
Neon
Answer
4
Sapanpreet Singh
Subject: Science
, asked on 12/1/18
Show diagrammatically the electron distribution in an aluminum atom and aluminuion.
Answer
1
Sushmit Chakraborty
Subject: Science
, asked on 11/1/18
WHY THE M SHELLS IS CAN ACCOMMODATE 18 ELECTRONS BUT IT DOSE'NT CONSTITUTE MORE THAN 8 ELECTRONS FOR ELEMENTS HAVING ATOMIC NUMBER MORE THAN 18?
Answer
1
Nisarg Vaghela
Subject: Science
, asked on 10/1/18
If maximum no. of electrons can be filled in M-shell is 18,then why electronic configuration of calcium is 2,8,8,2 ,knowing that outermost shell can have maximum 8 electrons and no new shell is filled unless the inner ones are filled completely,but here it only has 8 electrons in M-shell?
Answer
1
Sapanpreet Singh
Subject: Science
, asked on 9/1/18
Write the features of Rutherford's nuclear model of an atom.
Answer
4
Sapanpreet Singh
Subject: Science
, asked on 9/1/18
The mass number of element Lithium is 7. Calculate the number of neutrons.
Answer
1
Sapanpreet Singh
Subject: Science
, asked on 9/1/18
Show diagrammatically the electron distribution in an aluminum atom and aluminiumion.
Answer
1
Swayam Gupta
Subject: Science
, asked on 8/1/18
Plx answer is 7th question
Q.7. Find the valency of
N
7
17
a
n
d
C
17
35
l
Answer
1
Devesh Kumar Biswal
Subject: Science
, asked on 7/1/18
22. The atomic number of the atom which becomes stable by gaining 3 electrons in 5th sehll is-
(A) 56
(B) 49
(C) 51
(D) 54
Answer
4
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What are you looking for?
Q. The relative atomic mass of Boron is 10.84. Calculate the percentage of its isotopes occurring in nature.
elements X,Y,Z have valencies
1,2 and 3 respectively . Formula unit masses
of their
oxides are 62,
40,102 respectively If atomic mass of z is divided by thrice the difference in atomic masses
of x and y
then value obtained
is
the atomic number
of which of the following elements
a-carbon,b-
Oxygen,c-
Fluorine,d-
Neon
Q.7. Find the valency of
(A) 56
(B) 49
(C) 51
(D) 54