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प्रश्न
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
उत्तर
The distance between the centre of the nucleus and the outermost shell of an isolated atom is known as its atomic size. Radius of an atom is referred to as atomic size. As we advance along the group, the elements' atomic sizes grow. This is due to the fact that as we move along the group, additional shells are being added. This lengthens the gap between the outermost shell and the nucleus, increasing atomic size despite an increase in nuclear charge.
Additionally, as you move across a period from left to right, the atomic radius of the elements decreases. This occurs as a result of an increase in nuclear charge, which tends to draw electrons closer to the nucleus and cause an atom's size to decrease.
संबंधित प्रश्न
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
Name two elements in each case:
Actinides
Name the type of elements which have two outermost shell incomplete.
The horizontal rows in a periodic table are called _____.
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
Give the symbol and valency of the following element and radical.
Hydrogen
What are the elements.
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
An element with atomic number ______ will form a basic oxide.
