LIFE SCIENCE

Detailed explanation-1: -For example; four electron pairs are distributed in a tetrahedral shape. If these are all bond pairs the molecular geometry is tetrahedral (e.g. CH4).

Detailed explanation-2: -Methane has four C-H bonds. These are inclined at an angle of 109∘−28’ which is also called the tetrahedral angle. The four C-H bonds in methane are held at an angle of 109∘−28’ because this is the only angle in space at which repuslions between the four shared pairs of electrons is minimum.

Detailed explanation-3: -In methane the four electrons of carbon bind with the four electrons of four hydrogen atoms to form four covalent bonds. In methane carbon atoms are bonded with four hydrogen atoms. The structure of the methane is shown below. Thus, methane with the molecular formula $CH 4$ has 4 covalent bonds.

Detailed explanation-4: -The geometry of methane is tetrahedral.

Detailed explanation-5: -Methane has covalent bonds and sodium chloride has ionic bonds. The four strong carbon-hydrogen covalent bonds hold the methane molecule togetehr by sharing electrons. Ionic bonding occurs when electrons are transferred from one atom to another to ensure that each has complete outer shell of electrons.