Advertisements
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Given below are some elements of the modern periodic table. Atomic number of the element is given in parentheses.
A(4), B(9), C(14), D(19), E(20)
(a) Select the element that has one electron in the outermost shell. Also, write the electronic configuration of this element.
(b) Which two elements amongst these belong to the same group? Give reasons for your answer.
(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?
How many groups and periods are there in the modern periodic table?
Write the atomic numbers of two elements 'X' and 'Y' having electronic configuration 2, 8, 2 and 2, 8, 6 respectively.
An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table:
(a) group 4
(b) group 14
(c) group 15
(d) group 16
What do you understand by periodicity?
On the basis of electronic configuration, how will you identify the first and the last element of a period?
Explain
Size of atom changes when it loses or gain electron
Select the correct answer
Number of shells in potassium are
(a) Fill in the blanks and rewrite the completed statements:
(i) ________ group in the periodic table contains elements that are all gases at room temperature.
(ii) Very fine particles mainly scatter ______ light.
What is meant by a Group in the Periodic Table?
