Electronegativity is the ability of an atom to attract electrons to it, and, by the octet rule, strive to reach noble gas electron configuration. The most electronegative atom is Fluorine, for several reasons- It has the smallest radius, and it only needs to attract one electron to complete its valance shell.
The highest is Fluorine, the lowest is francium. Electronegativity increase from left to right, and the highest starting at the top of a column and gets smaller as it goes down.
Caesium
The smallest element on the Periodic Table is Hydrogen. It has only 1 electron in 1 electron shell and 1 proton in it's nucleus.
It is krypton as it the far most right on the periodic table, having the smallest radius
This element is the noble gas xenon (Xe) with 54 protons.
Hydrogen has the smallest atoms of any element, as it has only 1 electron in 1 electron shell and 1 proton. This is why it's first on the Periodic Table.
The smallest element is hydrogen (atomic number = 1). When one electron is added to hydrogen, hydride ion is formed and this is the anion with smallest ionic radius.
Lithium is the smallest element in the periodic table if Hydrogen and Helium are excluded.
The smallest atom in the periodic table is hydrogen, not fluorine.
Hydrogen has the smallest atomic size of any element.
Hydrogen
francium
The smallest element on the Periodic Table is Hydrogen. It has only 1 electron in 1 electron shell and 1 proton in it's nucleus.
iron
Fluorine(F)
Hydrogen (H) - with a single proton and electron.
Nitrogen
Hydrogen is the first, smallest, and lightest element. It is number 1 in the periodic table of elements.
Sodium has the greatest ionization energy of the four elements listed from column 1 of a wide form periodic table. Among this group of metals that readily form cations, the largest always has the lowest ionization energy and the smallest has the most. This is generally ascribed to the fact that the valence shell electron is further from the nucleus in the largest element and nearest in the smallest element.