1. What values are needed to determine the energy of an electron in a many‑electron atom?
O n
O
O m
O ms
2. What information is most important in determining the size of an orbital?
O n
O
O m
O ms
3. What information is needed to determine the orientation of an orbital?
O n
O
O m
O ms
4. What information is needed to determine the general shape of an orbital?
O n
O
O m
O ms

1. n

2. n

3.

4. l

Explanation:

Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1).For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from -l to +l.

Spin Quantum number : It describes the direction of electron spin. This is represented as s.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

12 is it do you think so