Multiple Choice
How many valence electrons does gallium (Ga) have?
4
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
Which of the following pairs of elements have the same number of valence electrons?
A
O and F
B
C and N
C
Na and K
D
Mg and Al
Verified step by step guidance1
Recall that valence electrons are the electrons in the outermost shell of an atom and determine the chemical properties of the element.
Identify the group number of each element in the periodic table, since elements in the same group have the same number of valence electrons.
For each pair, determine the group number: O (group 16), F (group 17); C (group 14), N (group 15); Na (group 1), K (group 1); Mg (group 2), Al (group 13).
Compare the group numbers of each pair to see if they match, which indicates the same number of valence electrons.
Conclude that Na and K both belong to group 1 and therefore have the same number of valence electrons, unlike the other pairs.
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