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Periodic Classification of Elements Flash Cards
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Samacheer Kalvi - English Medium
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33 cards in this set.
The number of periods and groups in the periodic table are______.
The basis of modern periodic law is______.
a) atomic number
_____ group contains the member of halogen family.
_____ is a relative periodic property
c) electron affinity
Chemical formula of rust is ________.
In the alumino thermic process the role of Al is _____.
b) reducing agent
The process of coating the surface of metal with a thin layer of zinc is called______.
Which of the following have inert gases 2 electrons in the outermost shell.
Neon shows zero electron affinity due to _____.
b) stable configuration of electrons
______ is an important metal to form amalgam.
If the electronegativity difference between two bonded atoms in a molecule is greater than 1.7, the nature of bonding is ______
2. ________ is the longest period in the periodical table.
3. ________ forms the basis of modern periodic table.
4. If the distance between two Cl atoms in Cl2 molecule is 1.98, then the radius of Cl atom is ________.
5. Among the given species A ,A+, and A, the smallest one in size is ________.
6. The scientist who propounded the modern periodic law is ________.
7. Across the period, ionic radii ________ (increases,decreases).
8. ________ and ________ are called inner transition elements.
Lanthanides and Actinides
9. The chief ore of Aluminium is ________.
10.The chemical name of rust is ________.
Hydrated ferric acid
Coating with Zn
Heating in the absence of air
Alumino thermic process
Group 18 elements
Noble gas elements
Moseleys periodic table is based on atomic mass.
FALSE (Moseley’s periodic table is based on atomic number.)
Ionic radius increases across the period from left to right.
FALSE (Ionic radius decreases across the period from left to right.)
. All ores are minerals; but all minerals cannot be called as ores;
Al wires are used as electric cables due to their silvery white colour.
FALSE (Al wires are used as electric cables because they are good conductors)
An alloy is a heterogenous mixture of metals.
FALSE (An alloy is a homogenous mixture of metals.)
(A): Assertion : The nature of bond in HF molecule is ionic.. (R): Reason : The electronegativity difference between H and F is 1.9
A is wrong, R is correct.
(A): Assertion : Magnesium is used to protect steel from rusting.. (R): Reason : Magnesium is more reactive than iron
A and R are correct, R explains the A.
(A): 3. Assertion : An uncleaned copper vessel is covered with greenish layer... (R): Reason : copper is not attacked by alkali
A and R are correct, R doesnt explains A.
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