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Chemistry Study Cards Chapter 5 (3-2) The length of each period in the sublevels being filled with electrons. periodic table is determined by the The elements that border the zigzag metalloids. line in the periodic table are The most characteristic property of the noble gases is that they are largely unreactive Compared to the alkali metals, the alkaline-earth metals Atomic size is determined by measuring the The element that has the greatest electronegativity is are less reactive. In a row in the periodic table, as the atomic number increases, the atomic radius generally Within a group of elements, as the atomic number increases, the atomic radius decreases In the alkaline-earth group, atoms with the smallest radii have the highest ionization energies As the atomic number of the metals of Group 1 increases, the ionic radius increases Across a period in the periodic table, atomic radii gradually decrease Which is the best reason that the atomic radius generally increases with atomic number in each group of elements? the number of energy levels increases distance between nuclei of adjacent atoms. fluorine increases As you move left to right from gallium through bromine, atomic radii generally decrease The energy required to remove an electron from an atom ____ as you move left to right from potassium through iron. The force of attraction by Group 1 metals for their valence electrons is generally increases weak The electrons available to be lost, valence electrons gained, or shared when atoms form molecules are called When chemical compounds form, lost, gained, or shared. valence electrons are those that may be The number of valence electrons in Group 1 elements is 1 The number of valence electrons in Group 17 elements is 7 The number of valence electrons in Group 2 elements is 2 As you move down the periodic table from carbon through lead, atomic radii generally increase elements in a group or column in the periodic table can be expected to have similar a horizontal row of blocks in the periodic table is called properties the length of each period in the periodic table is determined by the sublevels being filled with electrons period