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Carbon is the sixth element, with a ground-state electron configuration of 1s 2 2s 2 2p 2, of which the four outer electrons are valence electrons. Its first four ionisation energies, 1086.5, 2352.6, 4620.5 and 6222.7 kJ/mol, are much higher than those of the heavier group-14 elements.
At standard pressure, carbon, the lightest carbon group element, sublimes at 3825 °C. Silicon's boiling point is 3265 °C, germanium's is 2833 °C, tin's is 2602 °C, and lead's is 1749 °C. Flerovium is predicted to boil at −60 °C. [11] [12] The melting points of the carbon group elements have roughly the same trend as their boiling points ...
In honor of National Teacher Day and Teacher Appreciation Week, here are some deals for teachers and for those who want to show our educators a little love. 19 Teacher Appreciation Week freebies ...
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
In general bonds of carbon with other elements are covalent bonds. Carbon is tetravalent but carbon free radicals and carbenes occur as short-lived intermediates. Ions of carbon are carbocations and carbanions are also short-lived. An important carbon property is catenation as the ability to form long carbon chains and rings. [3]
Teachers are limited to one free pizza per day during the promotional period. Potbelly. Potbelly is giving teachers a free cookie or fountain drink when they buy an entree between May 6 — 12 ...
The following are the eligibility criteria for nominees. [1] They must: Be highly qualified teachers, as deemed by their states, districts, or schools; teachers in private/independent schools should meet the spirit of the principles and provisions of the No Child Left Behind Act, Public Law 107-110.
The Teacher Appreciation Day offer is available at participating restaurants nationwide. TGI Fridays to say ‘thank you’ to teachers with a free meal. Here’s how to get it
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