1. Chapter 4 Atomic Structure Review Pioneer High School Mr. David Norton

2. Chapter 4 Review What is the smallest particle of an element that retains the properties of that element? Who first suggested the idea of atoms, in the 4th century b.c.? The number of atoms in a copper coin suggests that...

3. Chapter 4 Review Know the ideas of Dalton’s atomic theory. What particles form the nucleus of an atom? What parts of Dalton’s original atomic theory were revised about a century ago?

4. Chapter 4 Review Know about the discovery of electrons. Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements? What hypothesis led to the discovery of the proton?

5. Chapter 4 Review Who discovered the neutron, and in what year? How does the mass of a neutron compare to the mass of a proton? Dalton theorized that atoms are indivisible, and atoms of the same element are identical. Today...

6. Chapter 4 Review As a result of the discovery of the nucleus by Rutherford, what model described an atom? Describe the nucleus of an atom. Know the properties of the electron. Atoms have what charge, and how many protons and electrons?

7. Chapter 4 Review Describe the number of protons and electrons in a given element, such as In. The atomic number of an element is the total number of … An element has an atomic number of 80. How many protons & electrons?

8. Chapter 4 Review The mass number of an element is equal to … How are the number of neutrons in the nucleus of an atom calculated? The sum of the protons and neutrons in an atom equals the...

9. Chapter 4 Review Using the periodic table, determine the number of neutrons in 16 O. How many protons, electrons, and neutrons does an atom with an atomic number of 50 and a mass number of 120 contain?

10. Chapter 4 Review How do the isotopes of hydrogen-1 and hydrogen-2 differ? What does the number 84 in the name krypton-84 represent? What unit is used to measure average relative atomic mass?

11. Chapter 4 Review Different elements have different numbers of … All atoms of the same element have the same … Why do chemists use relative comparisons of masses of atoms?

12. Chapter 4 Review What does one atomic mass unit (a.m.u.) equal? Isotopes of the same element have different ____ and ____. What does 238 92 U represent? Compare 80 38 X and 81 38 X.

13. Chapter 4 Review What are isotopes? Compare 20 10 X and 21 10 X. The atomic mass of an element is equal to … Calculate average atomic mass if one isotope of mass 20 is 25 % abundant, and another has a mass 22 is 75%?

14. Chapter 4 Review The atomic mass of an element depends on ____, _____, and ___. What are the Group A elements also known as? Which is/are a representative element(s)? Fe, Hg, U, Te, or Y

15. Chapter 4 Review Of the elements Pt, Sc, V, Li, and Kr, which is/are nonmetal(s)? What is each vertical column of elements in the periodic table called? Approximately how many elements exist today?

16. Chapter 4 Review What criterion is used to arrange the elements in rows and columns on the periodic table? What category (metals, nonmetals, or metalloids) includes the majority of the elements?

17. Chapter 4 Review A mystery element, Q, is a nonlustrous solid and a poor conductor of electricity. To what category of elements does it belong? Who first arranged the elements according to nuclear charge?