Question

Read the description of each element, then write its name and symbol

A) This non-gaseous and reactive metal belongs to group 16

B) This element has an atomic number of 42

C) This metal has an atomic mass of about 56

D) This Group 2 metal is in the sixth period

E) This metal element is liquid at room temperature

F) This is the lightest element of the second period

G) This element has a valence electron and six electronic layers

H) This element has a mass number of 184

I) This element has seven valence electrons and is in the fifth period

J) This element has four electronic layers and its outer layer is full

Answer 1

Diatomic carbon (systematically named dicarbon and 1λ2,2λ2-ethene), is a green, gaseous inorganic chemical with the chemical formula C=C (also written [C2] or C2). It is kinetically unstable at ambient temperature and pressure, being removed through autopolymerisation. It occurs in carbon vapor, for example in electric arcs; in comets, stellar atmospheres, and the interstellar medium; and in blue hydrocarbon flames.[1] Diatomic carbon is the second simplest form of carbon after atomic carbon, and is an intermediate participator in the genesis of fullerenes.

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