The amount of energy released when one or more electron is added to the neutral atom ▪︎electron affinity
▪︎electronegativity​

Explanation:

Electron affinity is a measure of the energy released when an extra electron is added to an atom. Electron affinities are measured in the gaseous state.

Electron affinity

Explanation:

Basically, electronegativity is the tendency of an atom to attract the electrons in a chemical bond towards itself but electron affinity is the energy change that occurs when an electron is accepted by an atom in its gaseous state to form an anion.

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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.