The Periodic Table

f-block element in period 7 of the periodic table, which consists of the elements actinium (Ac) through lawrencium (Lr)

element (except hydrogen) in group 1 of the periodic table

element in group 2 of the periodic table

half the distance between the nuclei of two identical atoms

average mass of all the isotopes of an element, based on the relative abundance of each isotope

net positive charge of an atom when electron shielding is considered

change in energy that occurs when an atom of a neutral gas gains an electron

decrease in attraction from the nucleus experienced by valence electrons due to the presence of inner electrons between the nucleus and the valence electrons

tendency of an atom to attract electrons toward itself when forming bonds

energy required to remove an electron from each atom in one mole of atoms in a gaseous state, resulting in one mole of ions with a 1+ charge

vertical column of the periodic table

element in group 17 of the periodic table

element in the f-block of the periodic table

energy required to remove an electron from a gaseous atom or ion

one of two or more atoms of an element that have the same number of protons but different numbers of neutrons

f-block element in period 6 of the periodic table, which consists of the elements lanthanum (La) to lutetium (Lu)

element in group 1, 2, or 13 to 18 of the periodic table

one of a class of elements that tend to have a metallic luster, be good conductors of electricity and thermal energy, and be malleable and ductile

one of a class of elements that tend to have properties of both metals and nonmetals

element in group 18 of the periodic table

one of a class of elements that tend to not have metallic luster, be poor conductors of electricity and thermal energy, and be neither malleable nor ductile

total charge of all protons within the nucleus

horizontal row of the periodic table

law that states that certain chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic numbers

table of all the elements arranged by atomic number into 18 vertical columns (groups) and 7 horizontal rows (periods)

energy required to remove a second electron from each ion in one mole of 1+ ions in a gaseous state, resulting in a mole of ions with a 2+ charge

element in groups 3 through 12 of the periodic table