Question

based on the information in the table, which two elements are most likely in the same group, and why?
facts about four elements
bismuth (bi)
nitrogen (n)
oxygen (o)
sodium (na)
thallium (tl)
atomic mass (amu)
209
14
16
23
204
total electrons
83
7
8
11
81
valence electrons
5
5
6
1
3
year isolated
1753
1772
1772
1807
1861

Explanation:

Step1: Understand the concept of groups in the periodic table

Elements in the same group have the same number of valence electrons.

Step2: Check the valence electrons of each element

Bismuth (Bi) has 5 valence electrons, Nitrogen (N) has 5 valence electrons. Sodium (Na) has 1 valence electron, Thallium (Tl) has 3 valence electrons, Oxygen (O) has 6 valence electrons.

Answer:

Bismuth and nitrogen, because they have the same number of valence electrons.