Multiple Choice
How many electrons are present in the n = 4 shell of a neutral calcium (Ca) atom?
20
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 krypton (Kr) have?
A
6
B
8
C
4
D
2
Verified step by step guidance1
Identify the group number of krypton (Kr) in the periodic table. Krypton is a noble gas located in Group 18.
Recall that elements in Group 18 have a full outer shell of valence electrons, which corresponds to 8 valence electrons (except for helium, which has 2).
Understand that valence electrons are the electrons in the outermost energy level (shell) of an atom that participate in chemical bonding.
Confirm that krypton's electron configuration ends with the p-block fully filled in its outermost shell, specifically with the configuration ending in 4s^2 3d^{10} 4p^6, indicating 8 valence electrons.
Conclude that krypton has 8 valence electrons because it has a complete octet in its outermost shell.
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