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Question
Complete the following flow chart.
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Solution
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Fill in the blank:
The modern periodic table consists of ……………. periods.
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Give two example of group 1 elements.
Give two example of group 18 elements.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Name the scientist who prepared modern periodic table.
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
(b) What is the number of elements is 3rd period, the modern periodic table?
What is a group in the periodic table?
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name two elements in Alkaline earth metals.
Name two elements in each case: Lanthanides
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Name the noble gas with 3 shells.
What is the number of elements in the 3rd period, of the modern periodic table?
Name an element of group 18 which can form compounds.
The horizontal rows in a periodic table are called _____.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Sulphate
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
Find the odd one out and give its explanation.
Write a scientific reason.
Lithium and sodium are included in the same group in the periodic table.
Explain structure of modern periodic table in short.
What is the symbol of the element Tungsten?
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has variable valency and is a member of the Oxygen family (group 16).
______ group elements are called alkaline earth metals.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Noble gas?
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
