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प्रश्न
Group 1 and 2 : s block : : group 13 and 18 : _______
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उत्तर
Group 1 and 2 : s block : : group 13 and 18 : p Block
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संबंधित प्रश्न
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.
Why do all the elements of the same group have similar properties?
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 the significance of atomic number in the modern classification of elements? Explain with the help of an example.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
Consider the following elements:
Ca, Cl, Na, I, Li, Ba, Sr, K, Br
Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.
What is the usual number of valence electrons in the atoms of the last element in a period?
Explain why All the elements of a group have similar chemical properties.
Explain why All the elements of a period have different chemical properties.
On the basis of electronic configuration, how will you identify the first element of a period?
What are the merits of the modern periodic table of elements?
What are the groups in a periodic table? Give two characteristics of each.
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name the type of elements which have outermost shell incomplete.
How does the electronic configuration of an atom relate to its position in the modern 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?
Name an alkali metal in period 3 and halogen in period 2.
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
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.
Bicarbonate
Give the chemical formula of carbonic acid
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
To the left of the zig-zag line in the periodic table are the metal elements.
Complete the following flow chart.
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is A element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Identify gas A in the following experiment.
The inert gas which lies in the third period is ______
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
Which one of the following elements exhibit maximum number of valence electrons?
Which of the following elements will form an acidic oxide?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
______ group elements are called alkaline earth metals.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Name the metalloids in the first twenty elements.
