O, O2-, S2-, and Se2-
O is smaller than O2- because O2- has 2 extra electrons but the same amount of protons as O, so they are held less tightly and the atom is bigger. Atom size increases as you move down the Periodic Table, so O2- < S2- < Se2-.
If the atoms are the same, it is the atomic radius.
Two atoms of same element (for a given isotope) are identical and hence have the same atomic radius.
The arrangement of atoms by increasing atomic number are shown in the periodic table.This can be seen from starting at H (Hydrogen) which has the smallest number of atoms and continues on from left to right.
Atomic radius decreases across a row (increasing positive charge in the nucleus causes electrons in the same energy level to "shrink" into the nucleus due to electrostatic attraction). This means that potassium has the largest atomic radius in period 4.
Atomic radius increases down the group. So larger atomic radius are present at the bottom.
If the atoms are the same, it is the atomic radius.
Two atoms of same element (for a given isotope) are identical and hence have the same atomic radius.
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The negative ionic radius is larger than the neutral atomic radius
van der waal radius is greater than co valent radius because van der waal radius is the distance between the nucleus of two atoms of different compound whereas covalent radius is distance between nucleus of atoms of same compound.
The arrangement of atoms by increasing atomic number are shown in the periodic table.This can be seen from starting at H (Hydrogen) which has the smallest number of atoms and continues on from left to right.
The atoms become smaller in atomic radius.
Since hydrogen atoms in the sun are fused into helium atoms, the amount of helium is increasing and the amount of hydrogen is decreasing.
Increasing the amplitude of the atoms vibrations
Sodium
The caesium atom with an empirical radius of 260 pm.
Atomic radius decreases across a row (increasing positive charge in the nucleus causes electrons in the same energy level to "shrink" into the nucleus due to electrostatic attraction). This means that potassium has the largest atomic radius in period 4.