Respuesta :
Answer: The correct answer is Option 3.
Explanation:
Elements are distributed in 7 Periods and 18 groups in a periodic table.
Elements which belong to same group show similar chemical properties because of the same number of valence electrons.
For the given options:
Option 1: Br, Ga and Hg
Bromine is present in Group 17, Gallium is present in 13 and Mercury is present in Group 12.
As, all the three elements belong to different groups. So, they do not show similar chemical properties.
- Option 2: Cr, Pb and Xe
Chromium is present in Group 6, Lead is present in Group 14 and Xenon is present in Group 18.
As, all the three elements belong to different groups. So, they do not show similar chemical properties.
- Option 3: O, S and Se
Oxygen, Sulfur and Selenium are present in Group 16.
As, all the three elements belong to same group. So, they will show similar chemical properties.
- Option 4: N, O and F
Nitrogen is present in Group 15, Oxygen is present in Group 16 and Fluorine is preset in Group 17.
As, all the three elements belong to different groups. So, they do not show similar chemical properties.
Hence, the correct answer is Option 3.
The list which includes elements with the most similar chemical properties is; Choice 3: O, S, Se
First, we must know:
Elements are arranged in 7 Periods and 18 groups in the periodic table.
Additionally, Elements in the same group of the periodic table often have similar chemical characteristics as a result of equal number of Valence electrons.
By considering Choices individually;
For Choice 1: (Br, Ga and Hg)
- Bromine is a member of Group 17, Gallium is a member of Group 13 and Mercury is a member of Group 12.
- Bromine is a member of Group 17, Gallium is a member of Group 13 and Mercury is a member of Group 12.All three elements belong to different groups. In essence, they do not show similar chemical properties.
For Choice 2: (Cr, Pb and Xe)
- The elements belong to different groups of the periodic table and consequently, they do not show similar chemical properties.
For Choice 3: (O, S and Se)
- Oxygen, Sulfur and Selenium are all members of Group 16(6)
- Since, all three elements belong to same group. In essence, they will show similar chemical properties.
For choice 4: (N, O and F)
- The elements belong to different groups of the periodic table and consequently, they do not show similar chemical properties.
Ultimately, the correct answer is Choice 3.
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