CHM 102A Lecture 1: structure of the atomm

(10 points-Due Tuesday September bui Subatomic Particles 1. In the nucleus of an atom are two types of subatomic particles_sns and 2.Elakors are the subatomic particles which form a cloud around the nucleus. 3. Which subatomic particles have no electrical charge? 4. Which subatomic particles have a positive (+) electrical charge? 5. Which subatomic particles have a negative(-) electrical charge? 6. The atomic number represents the number of and the number of for each element 7. The atomic mass is roughly equal to the sum of which two subatomic particles in an atom? 8. Isotopes have the same number of , but a different number of When an atom is electrically neutral it has an equal number of which two subatomic particles? 9. 10.Use the periodic table to answer the following questions: a. How many protons does Argon (Ar) have? b. How many electrons does Bromine (Br) have? c. What is the atomic mass of Zinc (Zn)? d. How many neutrons does Copper (Cu) have? Chemical Formulas 11. How many Hydrogen atoms are in CsH12Os? 12. How many Hydrogen atoms are in 4H20 13. CaC20s contains which 3 elements? 14. Write the name of the element represented by each of the following symbols: a. Na b. O c. Br d. Mg

Indicate which subatomic particle (proton, neutron, or electron) correctly matches each of the following statements. More than one particle can be used as an answer. Neutron ___________ Possesses a negative charge. Proton __________ Has no charge. Electron ______________ Has a mass slightly less than that of a neutron. ___________ Has a charge equal to but opposite in sign to that of an electron. ___________ Is not found in the nucleus. ______________ Has a positive charge. ____________ Can be called a nucleon. ______________ Is the heaviest of the three subatomic particles. _______________ Has a relative mass of 1836 if the mass of an electron is 1. ___________________ Has a relative mass of 1839 if the mass of an electron is 1.