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प्रश्न
On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases
उत्तर
(b) Decreases.
The size of the atom decreases on moving from left to right in a period of the periodic table. With an increment in the atomic number, both the proton number and the nuclear positive charge increase. As the nucleus attracts the outermost electron, the size of the atom decreases.
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संबंधित प्रश्न
Define the term : Atomic size
How does the valency of elements change of moving from left to right in the third period of the periodic table?
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca
Complete the following sentences
The similarities in the properties of a group of elements are because they have the same …………………
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 
Which is an inert gas?
Fill in the blank
Oxidising property ________from fluroine to iodine because the power to accpet electron decreases.
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)
What is meant by a Group in the Periodic Table?
