What is atomic radius ? How do the atomic radii of the elements change in a group?
Answers
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The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons.
Atomic radius goes on increasing when we go down in a group.
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The atomic radius is the distance between the centre of the nucleus of an atom and the outermost shell of the atom .
The atomic radius increases as we go down the group due to :
>> The number of shells increase by one .
>> The nuclear charge decreases down the group .
EXPLANATION :
⏩ The periodicity in properties refer to the appearance of properties in regular intervals of the Modern Periodic table when elements are arranged in increasing order of their atomic weights .
⏩ The atomic radius is one of the periodic properties which shows periodicity .
⏩ The atom contains positive charges as well as negative charges . The positive charged particles are called protons present in the nucleus at the centre of an atom .
⏩ The negatively charged particles or electrons are present in the energy shells of an atom .
⏩ The neutrons are the particles with no charge at all .