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प्रश्न
Match the atomic number with the following:
A gaseous element with valency 2.
पर्याय
19
15
8
4
2
उत्तर
8
संबंधित प्रश्न
The given table shows elements with the same number of electrons in its valence shell.
| Elements | A | B | C |
| m.p. | 63.0 | 180.0 | 97.0 |
Whether these elements belong to same group or period.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What is its valency?
The electronic configuration of an element T is 2, 8, 8, 1.
How many valence electrons are there in an atom of T?
Explain why the following statement is not correct:
Atoms of elements in the same group have the same number of electron(s).
Write scientific reason.
Elements belonging to the same group have the same valency.
Sodium and aluminum have atomic numbers 11 and 13, respectively. They are separated by one element in the periodic table and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.
An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
Which one of the following elements exhibits a maximum number of valence electrons?
Arrange the following as per the instruction given in the bracket:
P, Si, F, Be (decreasing order of valence electrons)
Elements of group 1 and elements of group 17 both have valency 1. Explain.
