Advertisements
Advertisements
प्रश्न
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
Advertisements
उत्तर
The number of valence electrons is 3
APPEARS IN
संबंधित प्रश्न
The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:
(a) In which group should they be?
(b) Which one of them is least reactive?
(c) Which one of them has the largest atomic size?
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
How does Chemical reactivity of elements change on going from left to right in a period of the periodic table?
Give example in support of your answer.
State one reason for keeping fluorine and chlorine in the same of the periodic table.
Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr:
| Li | Be |
| Na | |
| K | |
| Rb | |
| Cs | |
| Fr | Ra |
What happens to their metallic character?
Which one of the following does not increase while moving down the group of the periodic table?
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
F, Cl and Br are the elements each having seven valence electrons. Which of these (i) has the largest atomic radius, (ii) is most reactive? Justify your answer stating reason for each.
Name or state following with reference to the element of the first three periods of the periodic table.
A metal in period 3 having valency 3.
Select the correct answer from the options given below.
It is a metal in period 2 having electronic configuration 2, 1?
