https://padlet.com/304007/yocn8to79d8q en-us 2017-12-06 19:13:58 UTC 2023-06-20 08:42:42 UTC hello@padlet.com 304007 https://padlet.com/304007/yocn8to79d8q/wish/213872340 In each period(horizontal row), the atomic numbers increase from left to right. The periods are numbered 1 through 7 on the left-hand side of the table.]]> 2017-12-06 19:15:11 UTC https://padlet.com/304007/yocn8to79d8q/wish/213872340 304007 https://padlet.com/304007/yocn8to79d8q/wish/213873582 In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements.]]> 2017-12-06 19:17:27 UTC https://padlet.com/304007/yocn8to79d8q/wish/213873582 304007 https://padlet.com/304007/yocn8to79d8q/wish/213873989 Alkali metal. The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na),potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

]]> 2017-12-06 19:18:20 UTC https://padlet.com/304007/yocn8to79d8q/wish/213873989 304007 https://padlet.com/304007/yocn8to79d8q/wish/213874857 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 19:20:05 UTC https://padlet.com/304007/yocn8to79d8q/wish/213874857 304007 https://padlet.com/304007/yocn8to79d8q/wish/213877274  The lanthanides include elements having atomic numbers 57 (lanthanum) through 71 (lutetium). They are grouped apart from the rest of the elements in the Periodic Table because they all behave in a similar way in chemical reactions.]]> 2017-12-06 19:24:49 UTC https://padlet.com/304007/yocn8to79d8q/wish/213877274 304007 https://padlet.com/304007/yocn8to79d8q/wish/213878504 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 19:27:22 UTC https://padlet.com/304007/yocn8to79d8q/wish/213878504 304007 https://padlet.com/304007/yocn8to79d8q/wish/213879148 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 19:28:40 UTC https://padlet.com/304007/yocn8to79d8q/wish/213879148 304007 https://padlet.com/304007/yocn8to79d8q/wish/213879959 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 19:30:25 UTC https://padlet.com/304007/yocn8to79d8q/wish/213879959