Advertisements
Advertisements
प्रश्न
Select the correct answer from the options given below.
It is a metal in period 2 having electronic configuration 2, 1?
विकल्प
Beryllium
Lithium
Sodium
Advertisements
उत्तर
Lithium
APPEARS IN
संबंधित प्रश्न
How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table?
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong:
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
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
Which one of the following does not increase while moving down the group of the periodic table?
Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
Arrange the following as per instruction given in the bracket.
Li, K, Na, H ( decreasing order of their potential ionisation )
