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Deepa
Subject: Chemistry
, asked on 19/1/18
Q.27. Look at the elements in period of the periodic table and answer the question.
a) How does the number of protons in the nuclei change as you move from left to right along the period ?
b) How does the number of electrons in the outer electron shell change as you move from left to right?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Q.24. Following diagram shows the atomic structure of group 7 element and group 8 element
a) Which diagram shows group 8 element ?
b) Compare the atomic structure and explain why group 7 is highly reactive ?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Q.20. Following table shows the physical properties of halogen
a). What trends can you see in the melting points and the boiling points of the halogens ?
b) Over how many degrees celsius is chlorine a liquid ?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Solve this:
The diagram below shows part of the periodic table of elements.
The shaded area contains only metal.
Two other areas also contains only metal elements.
Which areas contain only metal elements ?
Tick the two correct boxes.
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Write materials required and procedure to prove that lithium is alkali metal.
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Q).a) Towards the right of Element B lies an element which is a soft metal, which can be cut with knife but it burns in water, identify the element and also write another metal which shows similar trend in chemical property?
Q.b) Student A says that element “I” is boron where as student B says that it is bromine whom do you support Student A or B d) Write the word equation for the reaction of sodium with water ? iii) Towards the right of Element B lies an element which is a soft metal, which can be cut with knife but it burns in water, identify the element and also write another metal which shows similar trend in chemical property?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Q.a) Mark an outline in periodic table such a way that it shows the position the of metals and non metals in the periodic table?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
The elements shown below are all in Group I of the periodic Table .
Element Symbol Electronic structure
Lithium Li 2,1
Sodium Na 2,8,1
Potassium K 2,8,8,1
a) Which element reacts most vigorously with cold water?
b) How many protons are there in potassium element?
c) What is valence electron, identify the valence electron of group 1?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
.
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
13.Look at the list of five elements below.
argon, bromine, chlorine, iodine, potassium.
c) Which of the five elements are liquid at room temperature?
d) Draw the atomic structure and show which of the element has full filled outermost
shell.
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
13.Look at the list of five elements below.
argon, bromine, chlorine, iodine, potassium.
a) Which of the five elements in the list are in the same group of the Periodic
Table?
b) From the list, choose one element which has one electron in its outer shell.
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Q). A student is asked to complete two sentences.
Metallic and non-metallic elements are classified in the ... (i) ... This can be used to ... (ii) ... the properties of
elements.
Which words correctly complete the gaps?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
The table below shows the electronic structure of six elements U to Z Element Electronic structure U --2,1 V-- 2,2 W --2,4 X --2,8,7 Y --2,8,8 Z --2,8,8,1. Give the letters of a) Two elements in the same period of the periodic table b) A noble gas c) A Group I metal
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
The table shows the densities of some Group 1 metals.
metal density in g/cm3
A lithium 0.53
B sodium 0.97
C potassium 0.86
D rubidium 1.53
Which metal sinks in benzene (density of liquid = 0.88 g/cm3) but floats
in nitrobenzene (density of liquid = 1.2 g/cm3)?
Answer
1
Deepa
Subject: Chemistry
, asked on 19/1/18
Elements X,Y and Z are in the same period of the periodic Table .X is
a metal ,Y is a non metal Z shows the properties of both metal and non
metals. What is the order of increasing proton ( atomic )number ?
Lowest to highest
A) X Y Z
B )X Z Y
C )Y Z X
D )Z Y X
Answer
1
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Next
What are you looking for?
a) How does the number of protons in the nuclei change as you move from left to right along the period ?
b) How does the number of electrons in the outer electron shell change as you move from left to right?
a) Which diagram shows group 8 element ?
b) Compare the atomic structure and explain why group 7 is highly reactive ?
a). What trends can you see in the melting points and the boiling points of the halogens ?
b) Over how many degrees celsius is chlorine a liquid ?
The diagram below shows part of the periodic table of elements.
The shaded area contains only metal.
Two other areas also contains only metal elements.
Which areas contain only metal elements ?
Tick the two correct boxes.
Q.b) Student A says that element “I” is boron where as student B says that it is bromine whom do you support Student A or B d) Write the word equation for the reaction of sodium with water ? iii) Towards the right of Element B lies an element which is a soft metal, which can be cut with knife but it burns in water, identify the element and also write another metal which shows similar trend in chemical property?
Element Symbol Electronic structure
Lithium Li 2,1
Sodium Na 2,8,1
Potassium K 2,8,8,1
a) Which element reacts most vigorously with cold water?
b) How many protons are there in potassium element?
c) What is valence electron, identify the valence electron of group 1?
argon, bromine, chlorine, iodine, potassium.
c) Which of the five elements are liquid at room temperature?
d) Draw the atomic structure and show which of the element has full filled outermost
shell.
argon, bromine, chlorine, iodine, potassium.
a) Which of the five elements in the list are in the same group of the Periodic
Table?
b) From the list, choose one element which has one electron in its outer shell.
Metallic and non-metallic elements are classified in the ... (i) ... This can be used to ... (ii) ... the properties of
elements.
Which words correctly complete the gaps?
metal density in g/cm3
A lithium 0.53
B sodium 0.97
C potassium 0.86
D rubidium 1.53
Which metal sinks in benzene (density of liquid = 0.88 g/cm3) but floats
in nitrobenzene (density of liquid = 1.2 g/cm3)?
a metal ,Y is a non metal Z shows the properties of both metal and non
metals. What is the order of increasing proton ( atomic )number ?
Lowest to highest
A) X Y Z
B )X Z Y
C )Y Z X
D )Z Y X