Advertisements
Advertisements
Question
Name or state following with reference to the element of the first three periods of the periodic table.
A non-metal in period 2 having electronic configuration 2, 6.
Advertisements
Solution
O [Oxygen]
APPEARS IN
RELATED QUESTIONS
Calcium is an element with atomic number 20. Stating reason, answer each of the following questions:-
(i) Is calcium a metal or a non-metal?
(ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19?
(iii) Write the formula of its oxide.
The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
(a) A and B
(b) B and D
(c) A and C
(d) D and E
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
Calculate the valency of element X whose atomic number is 9.
Explain
Size of atom changes when it loses or gain electron
Select the correct answer
Most reactive character among the elements given below is found in
The elements of one short period of the periodic table are given below in order from left to right:
Li Be B C O F Ne
(a) To which period do these elements belong?
(b) One element of this period is missing. Which is the missing element and where should it be placed?
(c) Place the three elements, fluorine, beryllium and nitrogen, in the order of increasing electro negativity.
(d) Which one of the above elements belongs to the halogen series?
The similarities in the properties of a group of elements are because they have the same ______.
