What is the hsol for kbr k+ + br- ? the lattice energy is –679 kj, the enthalpy of hydration for is –336 kj/mol, and the enthalpy of hydration for is –284 kj/mol. use hsol = –hlat + hhydr. –627 kj/mol –59 kj/mol 59 kj/mol 1,299 kj/mol

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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