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प्रश्न
An element X from group 2 of the periodic table reacts with an element Y from group 17 to form a compound.
(a) What is the nature of the compound formed?
(b) State whether the compound formed will conduct electricity or not.
(c) Give the formula of the compound formed.
(d) What is the valency of element X?
(e) How many electrons are there in the outermost shell of an atom of element Y?
उत्तर
(a) The resulting compound is an ionic compound since the elements of group 2 are metals and those of group 17, non-metals. When a metal reacts with a non-metal, electrons get transferred from the metallic atoms to the non-metallic atoms, and an ionic bond is formed.
(b) Yes, it will conduct electricity because an ionic compund has formed.
(c) Element X belongs to group 2 and its valency is 2. Element Y is from group 17 and its valency is 1. So, one atom of X combines with two atoms of Y to give a compound of the formula XY2.
(d) The valency of the element X is 2 because it belongs to group 2.
(e) Group 17 elements have seven valence electrons in their atoms.
Group number = valence electron+10
Valence electron = Group number - 10
= 17-10 = 7.
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संबंधित प्रश्न
Rewrite the following statement after correction, if necessary:
Isotopes are the elements of the same group.
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.
State whether true or false. If false, correct the statement.
Metals can gain electrons.
Match the following
| 1. | Galvanisation | Noble gas elements |
| 2. | Calcination | Coating with Zn |
| 3. | Redox reaction | Silver-tin amalgam |
| 4. | Dental filling | Alumino thermic process |
| 5. | Group 18 elements | Heating in the absence of air |
Moseley’s periodic table is based on atomic mass.
Which one of the following does not increase while moving down the group of the periodic table?
Which type of elements are poor conductors of heat and electricity?
Relate the names of the following scientists with the statements given below.
Arranged elements in a group of seven with increasing atomic masses and eighth elements with similar properties kept below the first like eight note in an act of music.
The atomic number of an element 'X' is 11.
- Write the electronic configuration of X and find its valency.
- Write the formula and nature of its oxide.
