https://padlet.com/3059991/tjk5pgtfm14k Carlos Hernandez en-us 2017-12-06 16:23:01 UTC 2023-10-20 07:43:03 UTC hello@padlet.com 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213778695 A period is the name given to a horizontal row of the periodic table. The periodic table has seven periods]]> 2017-12-06 16:24:26 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213778695 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213780889 a number of people or things that are located close together or are considered or classed together.]]> 2017-12-06 16:27:34 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213780889 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213781784 any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.

]]> 2017-12-06 16:28:46 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213781784 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213783685 The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).]]> 2017-12-06 16:31:49 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213783685 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213784483 any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.]]> 2017-12-06 16:33:07 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213784483 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213785165 any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence.]]> 2017-12-06 16:34:11 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213785165 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213785757 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. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored.]]> 2017-12-06 16:35:15 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213785757 3059991 https://padlet.com/3059991/tjk5pgtfm14k/wish/213786476 any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.]]> 2017-12-06 16:36:25 UTC https://padlet.com/3059991/tjk5pgtfm14k/wish/213786476