A covalent bond is a bond between two non-metal atoms in which electrons are SHARED between the two bonded atoms. An example of this would be, the C-H bonds that are present in the molecule Methane (

). any further questions?
Density is the mass of substance per unit volume of a substance. to solve the problem, first calculate the mass of the gas.
mass gas = ( mass of balloon with gas ) - ( mass of balloon )
mass gas = 10.24 g - 2.42 g
mass gas = 7.82 g
so the density
density = m / v = 7.82 g / 5470 cm3
density = 0.00145 g / cm3
Answer:
B) the electron
Explanation:
JJ Thompson discovered the model for electron