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Periodic Table

Across
also known as noble gas that is an element in group 18
horizontal row of the periodic table
properties of the elements are periodic function of their atomic numbers.
element that is shiny, malleable, good conductor of heat and electricity
sum of the numbers of neutrons and protons in the nucleus of an atom
also known as representative element, an element in groups 1, 2, and 13–18
also known as lanthanide or actinide an element in the bottom two rows; if in the first row, also called lanthanide, or if in the second row, also called actinide
table of the elements that places elements with similar chemical properties close together
inner transition metal in the top of the bottom two rows of the periodic table
one-, two-, or three-letter abbreviation used to represent an element or its atoms
element in group 15
average mass of atoms of an element, expressed in amu
element that conducts heat and electricity moderately well, and possesses some properties of metals and some properties of nonmetals
element in group 16
Down
vertical column of the periodic table
element in group 1
element that appears dull, poor conductor of heat and electricity
inner transition metal in the bottom of the bottom two rows of the periodic table
element in group 2
number of protons in the nucleus of an atom
element in groups 3–12
element in group 17