Multiple Choice
Which of the following represents the valence electron configuration for a krypton (Kr) atom?
1
views
10. Periodic Properties of the Elements
Valence Electrons of Elements
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many valence electrons does a boron (B) atom have?
A
4
B
2
C
3
D
5
Verified step by step guidance1
Identify the atomic number of boron (B), which is 5. This means boron has 5 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of boron: 1s\^2 2s\^2 2p\^1.
Recognize that the first shell (1s) is full and not part of the valence shell; the valence shell is the second shell (2s and 2p orbitals).
Count the electrons in the second shell: 2 electrons in 2s and 1 electron in 2p, totaling 3 valence electrons.
2:32mWatch next
Master Main Group Elements Valence Electrons with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Valence Electrons of Elements practice set
Problem sets built by lead tutorsExpert video explanations