Question

based on the information in the table, which two elements are most likely in the same group, and why? facts about four elements element atomic mass (amu) total electrons valence electrons year isolated bismuth (bi) 209 83 5 1753 nitrogen (n) 14 7 5 1772 oxygen (o) 16 8 6 1772 sodium (na) 23 11 1 1807 thallium (tl) 204 81 3 1861 bismuth and thallium, because their atomic masses are very similar nitrogen and oxygen, because they were both first isolated in the same year sodium and thallium, because their names both end in the same suffix: -ium bismuth and nitrogen, because they have the same number of valence electrons

Explanation:

To determine which two elements are in the same group, we use the periodic table rule: elements in the same group have the same number of valence electrons.

• Bismuth (Bi) has 5 valence electrons.
• Nitrogen (N) has 5 valence electrons.
• Other options: Atomic mass (bismuth - thallium), isolation year (nitrogen - oxygen), or name suffix (sodium - thallium) are not periodic table group - determining factors. So bismuth and nitrogen share the same valence electron count, indicating they are likely in the same group.

Answer:

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