VUIZ
ACUV
In 1998, scientists discovered that the expansion of the universe has been accelerating,
What force is causing this phenomena?
dark energy
Hubble's law
the Doppler effect
background radiation

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

hope it

and ur welcm

: )