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Question
Complete the following flow chart.
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Solution
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RELATED QUESTIONS
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
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.
What is meant by a group, in a periodic table?
Explain why, the noble gases are placed in a separate group.
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
(d) S
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same period of the periodic table?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What are the merits of the modern periodic table of elements?
(b) What is the number of elements is 3rd period, the modern periodic table?
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
Name two elements in halogens.
Name two elements in each case:
Transition element
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Name an alkali metal in period 3 and halogen in period 2.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
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- Formulae of their chlorides
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Sodium
Give the chemical formula of carbonic acid
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What are the elements.
Which of the following statements about the Modern periodic table is correct?
The K and L shells of the elements Na and Mg contain electrons.
Write an Explanation.
Period
Explain structure of modern periodic table in short.
State any five features of modern periodic table.
The scientist who propounded the modern periodic law is ______.
The element which has the least tendency to lose electrons is ______
An element which is an essential constituent of all organic compounds belongs to
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Noble gases are placed in the ______ group in the modern periodic table.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Name the non-metals in the first twenty elements.
