Multiple Choice
How do valence electrons influence the chemical reactivity of elements?
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 are present in a neutral lithium (Li) atom?
A
3
B
4
C
2
D
1
Verified step by step guidance1
Identify the atomic number of lithium (Li), which is 3. This means a neutral lithium atom has 3 electrons.
Recall that electrons are arranged in energy levels (shells) around the nucleus. The first shell can hold up to 2 electrons, and the second shell can hold up to 8 electrons.
Determine the electron configuration of lithium: the first 2 electrons fill the first shell (1s orbital), and the remaining 1 electron goes into the second shell (2s orbital).
Valence electrons are the electrons in the outermost shell. For lithium, the outermost shell is the second shell, which contains 1 electron.
Therefore, the number of valence electrons in a neutral lithium atom is 1.
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