Advertisements
Advertisements
प्रश्न
Which element has the electronic configuration 2, 8, 2?
उत्तर
Magnesium
APPEARS IN
संबंधित प्रश्न
Two elements ‘A’ and ‘B’ belong to the 3rd period of Modern periodic table and are in group 2 and 13, respectively. Compare their following characteristics in tabular form:-
(a) Number of electrons in their atoms
(b) Size of their atoms
(c) Their tendencies to lose electrons
(d) The formula of their oxides
(e) Their metallic character
(f) The formula of their chlorides
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
Name two elements you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
How does the number of:
valence electrons and
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing metallic character)
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element.
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
An element A has 2 electrons in its fourth shell. State:
its valency
