1. A subatomic particle that has a neutral charge is called a(n)

2. A subatomic particle that has a neutral charge is called a(n)
neutron.

3. A subatomic particle that has a positive charge is called a(n)

4. A subatomic particle that has a positive charge is called a(n)
proton.

5. An electron jumps to a new energy level when

6. An electron jumps to a new energy level when
the atom gains or loses energy.

7. What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

8. What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?39

9. Two different isotopes of an element have different

10. Two different isotopes of an element have different
numbers of neutrons.

11. An element’s atomic number is equal to its number of

12. An element’s atomic number is equal to its number of
protons.

13. An iron atom has an atomic mass of 56. Its atomic number is 26
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?

14. An iron atom has an atomic mass of 56. Its atomic number is 26
An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have? 30

15. The charge of an atom is

16. The charge of an atom is
neutral

17. Whose model determined that an atom’s positive charge is concentrated in the atom’s center?

18. Whose model determined that an atom’s positive charge is concentrated in the atom’s center?
Rutherford’s

19. In _______________________ atomic model, negative electrons orbit the positively charged nucleus.

20. In _______________________ atomic model, negative electrons orbit the positively charged nucleus.
Rutherford’s

21. What is an atom’s nucleus made of?

22. What is an atom’s nucleus made of?
protons and neutrons

23. Which of the following statements not true?
Protons have a positive charge.
Neutrons have no charge.
A nucleus has a positive charge.
Neutrons have a negative charge.

24. Which of the following statements not true?
Neutrons have a negative charge.

25. Thomson is responsible for discovering that an atom contains

26. Thomson is responsible for discovering that an atom contains
electrons

27. Thomson made his discovery about the atom during an experiment using

28. Thomson made his discovery about the atom during an experiment using
cathode rays

29. A subatomic particle that has a negative charge is called a(n)

30. A subatomic particle that has a negative charge is called a(n)
electron

31. Democritus’s original atomic theory was revised because it

32. Democritus’s original atomic theory was revised because it
did not have a scientific basis.

33. An atom’s mass number equals the number of

34. An atom’s mass number equals the number of
protons plus the number of neutrons.

35. According to Bohr’s theory, an electron’s path around the nucleus defines its

36. According to Bohr’s theory, an electron’s path around the nucleus defines its
energy level

37. Which statement about the modern model of the atom is not true?
Electrons can be found between energy levels.
Electrons can be found only in certain energy levels.
The precise location of electrons cannot be predicted.
Electrons are most likely to be found in orbitals.

38. Which statement about the modern model of the atom is not true?
Electrons can be found between energy levels.
Electrons can be found only in certain energy levels.
The precise location of electrons cannot be predicted.
Electrons are most likely to be found in orbitals.

39. Which statement about an element’s average atomic mass is correct?
It is determined by counting the number of isotopes in a sample of the element.
It is equal to one-twelfth the mass of the most common isotope.
It is a weighted average, so common isotopes have a greater effect than uncommon ones.
It is based on an isotope’s charge, so negatively charged isotopes have a greater effect than positive ones.

40. Which statement about an element’s average atomic mass is correct?
It is determined by counting the number of isotopes in a sample of the element.
It is equal to one-twelfth the mass of the most common isotope.
It is a weighted average, so common isotopes have a greater effect than uncommon ones.
It is based on an isotope’s charge, so negatively charged isotopes have a greater effect than positive ones.

41. Oxygen’s atomic number is 8. This means that an oxygen atom has

42. Oxygen’s atomic number is 8. This means that an oxygen atom has
eight protons in its nucleus.

43. According to Rutherford’s model of the atom, electrons behave like
planets orbiting the sun.

44. Which statement about the atom’s nucleus is correct?
The nucleus is made of protons and neutrons and has a negative charge.
The nucleus is made of protons and neutrons and has a positive charge.
The nucleus is made of electrons and has a positive charge.
The nucleus is made of electrons and has a negative charge.

45. Which statement about the atom’s nucleus is correct?
The nucleus is made of protons and neutrons and has a negative charge.
The nucleus is made of protons and neutrons and has a positive charge.
The nucleus is made of electrons and has a positive charge.
The nucleus is made of electrons and has a negative charge.

46. Dalton’s atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and

47. Dalton’s atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element are alike, and
atoms of different elements could form to join compounds

48. The smallest part of an element that still has the properties of that element is a(n)

49. The smallest part of an element that still has the properties of that element is a(n)
atom.