Problem: How many core electrons does an atom of bromine have? A) 35 b) 36 c) 30 d) 28 e) 18 a) 35 b) 36 c) 30 d) 28 e) 18 FREE Expert Solution Show answer. Mar 29, 2020 The electron configuration indicates that bromine has a total of 35 electrons. A bromine atom has two electrons in its first energy level, eight electrons in its second, 18 electrons in its third and seven electrons in its fourth. It has seven valence electrons, as indicated by the last part of the configuration, 4s2p5.

1. Bromine Number Of Protons
2. Total Number Of Electrons In Bromine

What are the quantum numbers for Bromine?

1 Answer

Quantum Numbers define the character of an electron in an energy specific orbital. They do not define an element.

Explanation:

4 Quantum Numbers define the character of an electron in an energy specific orbital.

According to the Pauli Exclusion principle, no two electrons can have the same set of 4 quantum numbers. This is significant in that elements with multiple electrons cannot have more than two in a single orbital.

Think of the set of Quantum Numbers for an electron as being a 'discrete energy window' for that electron and no other electron in the element's electron configuration can occupy the same energy window.

The 4 Quantum Numbers (QN) and what they describe are:

• Principle QN (#n#) => Defines Principal Energy Level
• Orbital QN (#l#); also known as Angular Momentum QN => Shape of Orbital
• Magnetic QN (#m_l#) => Orientation of orbital in 3 dimensions
• Spin QN (#m_s#) => the spin of the electron, up or down #pm 1/2#, respectively).

The 4 Quantum Numbers for the 'last' electron to fill a Bromine electronic configuration would be the electron in the half-filled #4p# orbital...

#=> (n, l, m_l, m_s) = (4, 1, {-1,0,+1}, -1/2) =># represents only one of 35 electrons in the neutral Bromine atom.

We choose the set of #m_l# because the three #4p# orbitals are identical and thus there are three configurations that have the same energy:

#4p_x^2 4p_y^2 4p_z^(color(blue)(1))#

#4p_x^2 4p_y^(color(blue)(1)) 4p_z^2#

#4p_x^(color(blue)(1)) 4p_y^2 4p_z^2#

Bromine Number Of Protons

Total Number Of Electrons In Bromine

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