Chapter 4 Review “Atomic Structure”

1. Chapter 4 Review“Atomic Structure” Honors Chemistry

2. Chapter 4 Review • All atoms of the same element have the same _____. • Know Dalton’s Atomic Theory. • An element has an atomic number of 76. What is the number of protons and electrons in a neutral atom of this element? • How is the number of neutrons in the nucleus of an atom calculated?

3. Chapter 4 Review • All atoms are neutral, with the number of protons equaling the ___. • Isotopes of the same element have different _____. • Using the periodic table, determine the number of neutrons in 16O. • What does the number 84 represent in the name krypton-84?

4. Chapter 4 Review • What is the correct complete symbol for an atom of tritium? • Know who discovered the neutron, and in what year. • Dalton said that atoms were indivisible and atoms of the same element were identical. Have any changes been made to this?

5. Chapter 4 Review • The mass number of an element is equal to _____. • The sum of the protons and neutrons in an atom equals the __. • What is the purpose of comparing the number of atoms of copper in a coin the size of a penny with the number of people on the earth?

6. Chapter 4 Review • The atomic number of an element is the total number of ____. • How do the isotopes of hydrogen-1 and hydrogen-2 differ? • What hypothesis led to the discovery of the proton? • The element Indium has __ protons and ___ electrons.

7. Chapter 4 Review • Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements? • Isotopes of the same element have different ____. • Know characteristics regarding the nucleus of an atom. • Are these the same element? 38? and 39?

8. Chapter 4 Review • Describe the model of the atom as a result of Rutherford’s discovery of the nucleus. • The smallest particle of an element that retains the properties of that element is a(n) ____. • Know the complete symbol for an element, and what it means: X 20 10

9. Chapter 4 Review • What is the relative mass of an electron? • The particles that are found in the nucleus of an atom are ____. • Know the ideas from Democritus. • Who conducted experiments to determine the quantity of charge carried by an electron?

10. Chapter 4 Review • How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain? • Who was the man who lived from 460 B.C. – 370 B.C., and was among the first to suggest the idea of atoms?

11. Chapter 4 Review • Know the characteristics of subatomic particles. • A fictitious element “X” has 10.0 % of the isotope with mass 55 amu, 20.0 % of the isotope with mass 56 amu, and 70.0 % of the isotope with mass 57 amu. Estimate the atomic mass of element X.

12. Chapter 4 Review • Element “Z” has two isotopes: one has mass number of 19.0 amu is 55.0 % abundant, and the isotope with mass number 21.0 amu is 45.0 % abundant. What is the average atomic mass for element Z? • How many protons are present in an atom of Beryllium-9?

13. Chapter 4 Review • Calculate the number of neutrons in Lead-210. • Determine the number of electrons in an atom of Iridium. • About how many more times massive is a proton than electron? • How many neutrons are present in an isotope of uranium-235?

14. Chapter 4 Review • What is the atomic number for an element with 41 neutrons and a mass number of 80? • Use the periodic table to determine the number of protons in barium. • How many protons are present in the nuclei of the three known isotopes of hydrogen?

15. Chapter 4 Review • What is the mass number for an oxygen atom that has 10 neutrons in its nucleus? • How many electrons are in an atom of gold? • What is the total number of subatomic particles in the nucleus of an atom of bismuth-209?

16. Chapter 4 Review • Use the periodic table to determine the number of electrons in a neutral atom of lithium. End of Chapter 4 Review