Which of the statement(s) below is/are true? 1. Elements in the same group have the same number of electrons, 2. Elements in the same group have similar chemical reactions, 3. Elements in the same group have different mass and proton numbers
Everyday Science / Chemistry — Multiple-choice practice
مندرجہ ذیل میں سے کون سا/سے بیان درست ہیں؟
- A. Only 1 and 2
- B. Only 2 and 3
- C. None of these
- D. Only 1
Correct answer
Only 2 and 3
Explanation
Explanation Elements in the same group have similar chemical properties because they have the same number of valence electrons , not total electrons. They show similar reactions due to similar outer shell configuration . However, they differ in atomic (proton) number and mass number. Therefore, statement 2 and 3 are correct. Last verified on 12-04-2026
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