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The answer is moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
What is Atomic Number ?
The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus.
Atomic Number (generally ) = Number of Protons
The atomic number can be used to uniquely identify ordinary chemical elements.
In an ordinary uncharged atom, the atomic number is also equal to the number of electrons.
The atomic number increases moving left to right across a period and subsequently so does the effective nuclear charge.
Therefore, moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.
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