Atetrahedral molecule has regions of high electron density around the central atom. these molecules have central atoms with lone pairs and atoms bonded to them.

Answer : A tetrahedral molecule has 4 regions of high electron density around the central atom. These molecules have central atoms with 0 lone pairs and 4 atoms bonded to them.

Explanation :  

As we are given the molecular geometry of the molecule that is tetrahedral and the hybridization of tetrahedral molecule is, .

That means the number of electron density around the central atom is 4 and the electronic geometry or the molecular geometry of the molecule will be tetrahedral.

And these molecule have central atoms with zero (0) lone pair and four (4) atoms bonded to them.

For example : In  molecule, the central atom is carbon and neighboring atoms are 4 hydrogen atoms. The number of electron density is 4 that means the hybridization will be and the electronic geometry or the molecular geometry of the molecule will be tetrahedral.

In  molecule, the central atom (carbon) has zero lone pair and the central atom (carbon) bonded with 4 hydrogen atoms.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).