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प्रश्न
Define groups of modern periodic table.
उत्तर
Groups are the vertical columns in the periodic table that run from top to bottom. The current periodic table has 18 groups.
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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.
Give two example of group 1 elements.
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
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.
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
On the basis of electronic configuration, how will you identify the first element of a period?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
Name two elements in Alkaline earth metals.
Name two elements in halogens.
Name the type of elements which have two outermost shell incomplete.
State its position in the periodic table?
What is the main characteristic of the last element in each period of the periodic table?
How many periods and groups are there in the modern periodic table?
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium hydroxide
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Write scientific reason.
Lithium and sodium are included in the same group in periodic table.
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.
State any five features of modern periodic table.
An element which is an essential constituent of all organic compounds belongs to
Which of the following is the outermost shell for elements of period 2?
Which one of the following elements exhibit maximum number of valence electrons?
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?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
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 a similar structure to diamond.
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 16 elements are collectively called as ______.
Spot the error:
The elements of group 13 are called the carbon family.
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?
Name the metalloids in the first twenty elements.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
