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प्रश्न
Name the element in period 3 which does not form oxide.
उत्तर
Argon
संबंधित प्रश्न
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?
(i) Number of valence electrons
(ii) Number of occupied shells
(iii) Size of atoms
(iv) Metallic character of element
(v) Effective nuclear charge experienced by valence electrons
Which element has a total of three shells, with four electrons in its valence shell?
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 | Ra |
What happens to the size of atoms?
What do you understand by periodicity?
An element X belong to 4th period and 17th group, state.
name of the element.
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
The following questions refer to the Periodic Table.
What is the common feature of the electronic configurations of the elements in group 7?
An element A has 2 electrons in its fourth shell. State:
its valency
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.
