Such a carbon atom forms linear or digonal structure because it is 'sp' hybridized.
If there are only two atoms, you can only have a linear/180 degree angle...think about it
trigonal planer
Linear, 180 degrees
Hydrogen cyanide is a hydrogen bonded to a complex ion, cyanide (CN-). The hydrogen is single bonded to the cyanide ion, which is a carbon triple bonded to a nitrogen atom. See the link below for a good representation of this molecule.
Single and triple
A carbon atom can form 4 single covalent bonds
No, ethylene (ethene) has a carbon-carbon double bond, in addition to four other single bonds between carbon and hydrogen.
Carbon exists both as atomic carbon (a single carbon atom) and as carbon molecules (Fullerenes) The atomic carbon is a very short lived species. The Fullerenes (like Buckey Balls) are very stable.
The molecular geometry of the compound CO32- is trigonal planar. It has a single atom of carbon bound to three atoms of oxygen.
Trigonal Pyramidal
What is a single carbon-carbon bond
Font geometry are angles, spans and lenghts in which single letters of the font are designed.
Two dimensional geometry is called "plane geometry" meaning that it occurs on a single surface or plane. The objects used in plane geometry are called plane figures.
A saturated fatty acid chain is composed of a carbon chain with only single covalent bonds. This creates a tetrahedral geometry of the atoms. An unsaturated fatty acid chain is composed of a carbon chain with one or more double covalent bonds. This creates a trigonal geometry of the atoms at the double covalent bond.
There are many compounds that exhibit tetrahedral structure. Some of those compounds are carbon tetrachloride (CCl4), chloroform (CHCl3), and methane (CH4). Many compounds of carbon (those which don't contain double bonds) are tetrahedral in structure because carbon tends to form four single bonds.
Carbon can have maximum of 4 single bonds around it, thus 4 hydrogen atoms.
The molecular geometry of NO2 is linear. N(triple bond)N(single bond)O
Electron geometry for this is tetrahedral. There are two O-F single bonds, which makes 2 electron groups. There are two lone pairs around oxygen, which make up the last two electron groups. Molecules with four electron groups has a tetrahedral Electron geometry.
Ethylene has 4 single bonds (carbon to hydrogen) and 1 double bond (carbon to carbon).
Since there is 4 electron domains which are all single bonds without any lone pairs, the molecular geometry is tetrahedral.