Advertisements
Advertisements
प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.
Advertisements
उत्तर
Non-metallic elements present in Period 3 of Groups 15 and 16 - Phosphorus and sulphur
APPEARS IN
संबंधित प्रश्न
The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis.
| Period No. | ||
| 2 | Li(3) | Be(4) |
| 3 | Na(11) | Mg(12) |
| 4 | K(19) | Ca(20) |
| 5 | Rb(37) | Sr(38) |
(i) Write the electronic configuration of Ca.
(ii) Predict the number of valence electrons in Rb.
(iii) What is the number of shells in Sr?
(iv) Predict whether K is a metal or a non – metal.
(v) Which one of these elements has the largest atom in size?
(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
How does Nature of oxides of elements change on going from left to right in a period of the periodic table?
Give examples in support of your answer.
In each of the following pair, choose the atom having the bigger size:
(a) Mg (At. No.12) or Cl (At. No.17)
Why fluorine has higher E.N. than chorine?
What will be the valency of an element of atomic number 9 (nine)?
What is meant by periodicity of elements?
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
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 |
To which period do these elements belong?
Name or state following with reference to the element of the first three periods of the periodic table.
The valency of elements in group 1 [I–A].
