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For a more detailed discussion see electron subshell filling and the electron dot diagrams based on that approach.Once the basics have been mastered as they are presented here, those two pages will add an extra level of understanding to this topic.His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

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It came little over a week after another alleged chemical attack hit a hospital in the town of Latamneh, just 14 miles away.

These dot diagrams are made for neutral atoms, meaning atoms that have the same number of electrons as protons.

The number of protons (also called the Atomic Number) of an element makes it what it is.

Over the past year, the charity has received reports of at least 71 attacks on 32 different health facilities it runs or supports in Syria.

Staffan de Mistura, the UN special envoy for Syria, said a UN Security Council meeting would be held on the latest attack as agencies are activated to discover “precisely” what occurred in Khan Sheikhoun.

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