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प्रश्न
Identify the term/substance in the following:
The electrons present in the outermost shell of an atom.
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उत्तर
The electrons present in the outermost shell of an atom: Valence electrons
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संबंधित प्रश्न
The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present:
| Chemical test | Observation | Conclusion |
| To solution X, ammonium hydroxide is added in minimum quantity first and then in excess |
A dirty white precipitate is formed which dissolves in excess to form a clear solution |
(1) |
| To solution Y ammonium hydroxide is added in the minimum quantity first and then in excess |
A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution. |
(2) |
| To solution W a small quantity of sodium hydroxide solution is added and then in excess. |
A white precipitate is formed which remains insoluble. |
(3) |
| To a salt Z calcium hydroxide the solution is added and then heated. |
A pungent smelling gas turning moist red litmus paper blue is obtained. |
(4) |
Why do atoms combine?
Give the conditions for coordinate bond formation.
Choose the correct answer from the options given below
Which one is coordinate molecule?
What is a lone pair of electrons?
Draw an electron dot diagram of a hydronium ion and label the lone pair of electrons.
What is the term defined below?
A bond formed by a shared pair of electrons with both electrons coming from the same atom.
Give suitable chemical terms for the bond formed by a shared pair of electrons with both electrons coming from the same atom.
Bonding in this molecule can be understood to involve coordinate bonding.
Give reason for the following:
Covalent compounds have a low melting and boiling point.
