Question

1. which statement best describes why isotopes of carbon (c - 12 and c - 14) behave almost the same in chemical reactions? mark only one oval. they have different numbers of neutrons they have the same number of protons and electrons their mass numbers are the same one is radioactive and one is not 32. which statement best explains why atoms are neutral? mark only one oval. they contain the same number of protons and electrons they contain the same number of protons and neutrons they contain the same number of electrons and neutrons their nucleus has no charge 29. which of the following elements is most similar in properties to chlorine (cl)? mark only one oval. oxygen (o) fluorine (f) argon (ar) sodium (na) 30. which model of the atom first introduced the idea of a positively charged nucleus? mark only one oval. daltons the solid sphere thomson: plum pudding rutherford: the gold foil experiment bohr: planetary orbit model

Explanation:

• Question 31: Isotopes like C - 12 and C - 14 have the same number of protons (which determines the element's identity) and different numbers of neutrons. This is why they have almost the same chemical behavior as chemical reactions involve electrons and the electron - configuration is determined by the number of protons.
• Question 29: Chlorine is in Group 17 (halogens). Fluorine is also in Group 17 and elements in the same group have similar chemical properties due to the same number of valence electrons.
• Question 30: Rutherford's gold foil experiment led to the discovery of the positively - charged nucleus. His model proposed a small, dense, positively - charged nucleus with electrons orbiting around it.
• Question 32: Atoms are neutral because they contain the same number of protons (positively charged) and electrons (negatively charged). The neutrons are neutral and do not contribute to the overall charge of the atom.

Answer:

• Question 29: C. Fluorine (F)
• Question 30: B. Rutherford: The gold foil experiment
• Question 31: D. They have different numbers of neutrons
• Question 32: D. They contain the same number of protons and electrons