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प्रश्न
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
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उत्तर
It's a metal.
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संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
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
How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?
Arrange the following elements in increasing order of their atomic radii:
Li, Be, F, N
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
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 atomic numbers of three elements A, B and C are given below:
| Element | Atomic number |
| A | 5 |
| B | 7 |
| C | 10 |
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
An element X belong to 4th period and 17th group, state.
no of valence electrons in it
Which element has:
twice as many electrons in its second shell as in its first shell?
Name or state following with reference to the element of the first three periods of the periodic table.
The non-metallic element present in period 3 other than sulphur and chlorine.
