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periodic table

Across
is a column of elements in the periodic table of the chemical elements.
any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table.
any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table.
a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects
any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table.
Down
is the name given to a horizontal row of the periodic table. ... Period 1 contains only two elements: hydrogen and helium.
any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table.
any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g., iron, manganese, chromium, and copper
an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons
functions of their atomic numbers. 2. Also called Mendeleev's law.
an element or substance that is not a metal.
is an effective conductor of electricity and heat