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प्रश्न
Which of the following have inert gases 2 electrons in the outermost shell.
पर्याय
He
Ne
Ar
Kr
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उत्तर
He
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संबंधित प्रश्न
Rewrite the following statement after correction, if necessary:
Isotopes are the elements of the same group.
Why do we classify elements?
Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electron shells but different number of electrons in their outermost shells. It was found that elements A and G combine to form an ionic compound. This ionic compound is added in a small amount to almost all vegetables and dishes during cooking. Oxides of elements A and B are basis in nature while those of elements E and F acidic. The oxide of element D is, however, almost neutral. Based on the above information, answer the following questions:
(a) To which group or period of the periodic table do these elements belong?
(b) What would be the nature of compound formed by a combination of elements B and F?
(c) Which two of these elements could definitely be metals?
(d) Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(e) If the number of electrons in the outermost shell of elements C and G be 3 and 7 respectively, write formula of the compound formed by the combination of C and G.
In which block of the modern periodic table are the nonmetals found?
If the distance between two Cl atoms in a Cl2 molecule is 1.98Å, then the radius of the Cl atom is ______.
Identify the bond between H and F in the HF molecules.
The elements A, B, and C belong to groups 1, 14, and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?
The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
Identify and name the metals out of the following elements whose electronic configurations are given below.
- 2, 8, 2
- 2, 8, 1
- 2, 8, 7
- 2, 1
Identify the following:
An element in Period 1 which can be placed in both Group 1 and Group 17 of the Periodic Table.
