Consider the following statements as they apply to quantum numbers. decide if each statement is true or false.

a. the three quantum numbers (n, l , and ml) define an atomic orbital. if n, the principal quantum number, has a value of 6 the maximum value of l is 6.
b. the principal quantum number, n, can have any integer value from 0 to infinity. for electrons in s, p, and d orbitals, the d electrons are the most shielded.
c. the magnetic quantum number, ml indicates the orientation of the orbital in the space around the nucleus.

A. False

B. False

C. True

Explanation:

A. The three quantum numbers (n, l, and ml) define an atomic orbital. If n, the principal quantum number, has a value of 6 the maximum value of l is 6. FALSE. The first part is true. However, the maximum value of l is n-1. So, if n is 6, l can take values up to 5.

B. The principal quantum number, n, can have any integer value from 0 to infinity. For electrons in s, p, and d orbitals, the d electrons are the most shielded. FALSE. n can take positive integer values, that is, it cannot take the value 0. Usually, the d electrons are the most shielded.

C. The magnetic quantum number, ml indicates the orientation of the orbital in the space around the nucleus. TRUE. For instance, spheric s orbital has only 1 orientation (1 value for ml), whereas lobed p orbital can be oriented along the three axes (3 values for ml).

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

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