The third sub level. On the periodic table it is the 3rd row
Answer:
Application Dose limits
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Effective dose (whole body), Hp (10) 50 mSv per year (or 1mSv per week)
20 mSv per year (or 0.4 mSv per week) averaged over
defined periods of five years
Annual equivalent dose to lens of the eye, Hp (3) 150 mSv
Annual equivalent dose to the skin, Hp (0.07) 500 mSv
Annual equivalent dose to hands and feet 500 mSv
Explanation:
Families contain elements with similar characteristics, usually determined by the number of electrons in the outer electron energy level. atomic number atomic mass symbol element name Alkali Metals The alkali metals have 1 valence electron. They're soft metallic solids, with characteristic metal properties of shiny luster and high thermal and electrical conductivities. The alkali metals have low densities and melting points, increasing and decreasing respectively with increasing atomic mass.
The alkali metal react vigorously with water, producing hydrogen gas and a solution of an alkali metal hydroxide. These reactions are very exothermic, in many cases generating enough heat to ignite the H , producing fire or sometimes even an explosion.
Carbon dioxide should be the answer considering its a huge focal point in our climate today and how it affects it.