Question

1. the nucleus of isotope a of an element has a larger mass than isotope b of the same element. the number of neutrons in the nucleus of isotope a is __________ the number of protons in the nucleus of isotope b. a. less than b. greater than c. the same as 16. an atom is electrically neutral when its a. neutrons balance the protons and electrons. b. nuclear forces stabilize the charges. c. numbers of protons and neutrons are equal. d. numbers of protons and electrons are equal. 17. the force between the nucleus and the electron cloud is ________. the force between the electrons in the electron cloud is __________. a. repulsive; attractive b. attractive; repulsive c. repulsive; repulsive d. attractive; attractive part 2 open response: answer the following questions in their entirety on your answer sheet. if a question has multiple parts, be sure to clearly label each part. point values are indicated next to each question. (60 pts total) for #21 - 32, match the vocabulary terms with their correct definition. (12 pts) 18. atom a. atoms of the same element with different masses. 19. atomic number b. this contributes to the mass of an atom but not its charge. 20. isotope c. this differs amongst isotopes and thus must be included in their notation. 21. proton d. the smallest unit of an element that still retains its properties. 22. neutron e. this is a row on the periodic table. 23. electron f. the periodic table is arranged by this. 24. quark g. this is a charged atom. 25. mass number h. the weighted average of all of the different isotopes of an element. 26. average atomic mass i. the number of these determines the identity of an atom. 27. group j. the number of these determines the charge and bonding behavior of an atom. 28. period k. this can also be referred to as a family. 29. ion l. the attraction between these holds the nucleus together. 30. differentiate between the plum pudding model and the nuclear model for the atom. (2 pts) 31. differentiate between the bohr model and the electron cloud model for the atom. (2 pts) 32. explain how a bohr model is a helpful tool for visualizing the structure of the atom. include what you can determine about an atoms structure from a bohr model. then include one major short - coming of the model that does not accurately represent an atoms structure. (5 pts) 33. use the information provided and a periodic table to complete the chart on your answer sheet. (8 pts)

Explanation:

15.

Isotopes of the same element have the same number of protons. Mass differences are due to different numbers of neutrons.

An atom is neutral when the positive - charged protons and negative - charged electrons are equal in number.

The nucleus is positively charged and the electron cloud is negatively charged, so the force between them is attractive. Electrons are negatively charged, so the force between electrons in the electron cloud is repulsive.

Answer:

C. the same as

16.