https://padlet.com/303968/h0jrceug3aml Made with a warm hug en-us 2017-12-06 16:23:16 UTC 2017-12-13 16:44:45 UTC hello@padlet.com 303968 https://padlet.com/303968/h0jrceug3aml/wish/213779279  In each period(horizontal row), the atomic numbers increase from left to right. ]]> 2017-12-06 16:25:23 UTC https://padlet.com/303968/h0jrceug3aml/wish/213779279 303968 https://padlet.com/303968/h0jrceug3aml/wish/213781153 In chemistry, a group is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, and the f-block columns are not numbered. ]]> 2017-12-06 16:27:57 UTC https://padlet.com/303968/h0jrceug3aml/wish/213781153 303968 https://padlet.com/303968/h0jrceug3aml/wish/213782038 The alkali metals are a group in the periodic table consisting of the chemical elements lithium, sodium, potassium, rubidium, caesium, and francium]]> 2017-12-06 16:29:09 UTC https://padlet.com/303968/h0jrceug3aml/wish/213782038 303968 https://padlet.com/303968/h0jrceug3aml/wish/213783401 any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table. They are reactive, electropositive, divalent metals, and form basic oxides that react with water to form comparatively insoluble hydroxides.]]> 2017-12-06 16:31:21 UTC https://padlet.com/303968/h0jrceug3aml/wish/213783401 303968 https://padlet.com/303968/h0jrceug3aml/wish/213783989 The rare earth elements (or rare earth metals) include the elements with atomic numbers 57 through 71, and, named in order, are lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium etc]]> 2017-12-06 16:32:20 UTC https://padlet.com/303968/h0jrceug3aml/wish/213783989 303968 https://padlet.com/303968/h0jrceug3aml/wish/213805293 The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. ]]> 2017-12-06 17:07:21 UTC https://padlet.com/303968/h0jrceug3aml/wish/213805293 303968 https://padlet.com/303968/h0jrceug3aml/wish/215873773 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.]]> 2017-12-13 16:44:32 UTC https://padlet.com/303968/h0jrceug3aml/wish/215873773