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प्रश्न
List any two properties of the elements belonging to the first group of the modern periodic table.
उत्तर
First group elements are also know as alkali metals. They possess following properties:-
1. These elements exhibit +1 valency.
2. These are very reactive that do not found freely in nature.
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संबंधित प्रश्न
Match the atomic number 2, 4, 8, 15 and 19 with each of the following
1) A solid non metal belonging to the third period.
2) A metal of valency 1.
3) A gaseous element with valency 2.
4) An element belonging to Group 2
5) A rare gas.
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is ______.
What happens to the metallic character of the elements as we go down in a group of the periodic table?
Fill in the blank in the following statement:
On moving form right to left in the second period, the number of valency electrons ...............
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
Arrange the following in order of increasing radii:
N, O, P
Moving down in the second group, number of valence electrons ______.
An element A has 2 electrons in its fourth shell. State:
is it an oxidising or reducing agent
Name the elements in the correct order of their increasing atomic numbers present in the first, second, and third short periods of the periodic table.
State which of the elements are –
- metallic
- non-metallic
- noble gases
in each of the periods 2 and 3.
There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively.
Classify the above elements as metals and non-metals.
