Which of the following statements is/are CORRECT?
1)Chemical reactions result in the gain,loss,or rearrangement of valence electrons.
2)For main group elements,the number of valence electrons equals eight minus the element's group number.
3)Core electrons are not involved in bonding or in chemical reactions.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3

Question

Quizplus · Accepted Answer

1) This statement is correct as chemical reactions involve the gain, loss or rearrangement of valence electrons.
2) This statement is not entirely correct. For main group elements, the number of valence electrons equals the element's group number. For example, Group 1 elements have 1 valence electron, Group 2 elements have 2 valence electrons, and so on. This holds true for all main group elements except for helium, which has only 2 valence electrons despite being in Group 18.
3) This statement is also correct as core electrons are not involved in bonding or chemical reactions.

Which of the Following Statements Is/are CORRECT