Stable electron configurations are likely to contain . > filled energy sublevels. -fewer electrons than unstable configurations. -unfilled s orbitals. -electrons with a clockwise spin. is this correct ? ?

The correct option is filled energy sublevels

Explanation:

When the energy sublevels of an atom is completely filled, the atom achieves stable electron configuration. Examples of atoms in this category are the noble gases, they have a completely filled energy and hence have a stable electron configuration. This stable electron configuration also makes them stable elements that resist undergoing chemical reactions as they do not easily form bonds with other elements.

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.

b. is the answer hoped i