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प्रश्न
State the property trends in general of elements on moving from left to right in a period of the periodic table.
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उत्तर
Property trends of elements from left to right in a period:
- Number of electron shells remains the same.
- Valence electrons increase by one.
The transition from metallic to non-metallic character increases. - Size of atom decreases.
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संबंधित प्रश्न
How many groups and periods are there in the modern periodic table?
Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.
Write the number of vertical columns in the modern periodic table. What are these columns called?
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
Which of the following element would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca
How do the following change on moving from left to right in a period of the periodic table?
Give examples in support of your answer.
Chemical reactivity of elements ?
How do you calculate the possible valency of an element from the electronic configuration of its atoms?
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
Arrange the following as per instruction given in the bracket.
Li, K, Na, H ( decreasing order of their potential ionisation )
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
