Question

Which of the following atomic numbers of elements have similar chemical properties?

• A. 7, 8, 9
• B. 9, 17, 35
• C. 3, 10, 11
• D. 10, 11, 12

Answer 1

The Correct Option is B

To solve this question, we need to determine which of the following sets of atomic numbers corresponds to elements that have similar chemical properties.

1. Elements with Similar Chemical Properties:
Elements with similar chemical properties are typically in the same group (column) of the periodic table. Elements in the same group have the same number of valence electrons, which leads to similar chemical behavior.

2. Evaluating the Options:

• (1) 7, 8, 9 – These correspond to Nitrogen (7), Oxygen (8), and Fluorine (9), which are in different groups (15, 16, and 17), so they do not have similar properties.
• (2) 9, 17, 35 – These correspond to Fluorine (9), Chlorine (17), and Bromine (35). These are all halogens (group 17), so they have similar chemical properties. ✔
• (3) 3, 10, 11 – These correspond to Lithium (3), Neon (10), and Sodium (11). Neon is a noble gas, while Lithium and Sodium are alkali metals, so they do not share similar properties with Neon.
• (4) 10, 11, 12 – These correspond to Neon (10), Sodium (11), and Magnesium (12). Sodium and Magnesium are metals, but Neon is a noble gas, so they do not have similar properties.

Final Answer:
The correct answer is (B) 9, 17, 35, as they are all halogens in group 17.