periodic table

periods

horizontal

• 7 periods

• all numbers in the same period have the same number of valence electrons(rings)

groups

• 18 groups

• Elements in the same group have the same number of electrons in their outer shell.

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valence electrons

• Group 1 has 1 valence electron, Group 2 has 2, and Groups 13–18 have 3 through 8

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metals

generally solids, lustrous, good conductors, malleable and ductile, high melting points

combine with nonmetals, but generally not with each other

non metals

solid or gas, non-lustrous, poor conductors, low melting points and densities

combine with metals and nonmetals[

lanthanides and actinides

two rows of inner transition metals shown at the bottom of the periodic table

They are silvery-white, soft metals with high melting points

alkali metals