Which of the following quantum number combinations is not allowed in an atom?
a. n = 2, l = 1, mr = -1

b. n = 1, l = 1, m = 0

c. n = 8, l = 5, m = -4

d. n = 6, l = 3, m = 2

B. n = 1, l = 1, m = 0

Explanation:

The quantum numbers have the function to locate an electron, so two electrons can't have all the same quantum numbers. There are four:

n - Is the principal quantum number and represents the levels. It varies from 1 to 7, and can be represented by the letters K, L, M, N, O, P, and Q;

l - Is the azimuthal quantum number and represents the sublevels. It varies from 0 to n-1, and can be represented by the letters s, p, d, e, f, g, etc.;

m - Is the magnetic quantum number and represents the orbital. It varies from -l to +l passing by the 0;

ms - Is the spin number, which represents the spin of an electron. It can be +1/2 or -1/2.

In letter B, for n=1, the maximum valor from l is n-1 = 1-1 = 0, then, l = 1 is not possible.

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.

mark brainliest and have a great day!

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance