Electrically neutral molecules formed by covalent bonds between atoms that have the same or similar electronegativity are called

non polar molecules

Explanation:

An electronegative atom is the one which attracts the shared pair of electron towards itself.

A polar covalent molecule is defined as the molecule which is formed when there is a difference of electronegativities between the atoms. Example:

Non-polar covalent molecule is defined as the molecule which is formed when there is no difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the equal sharing of electrons between the atoms.  Example:

Hence, the correct answer is non polar covalent molecule.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.