Atoms Test Review Graded Work #______
Read (and understand) notes and be able to complete all problems from the Atoms Worksheets.
1._____Caluclate the number of neutrons of the atom whose atomic number is 42 and whose mass number is 96.
2._____How many electrons are present in an atom of merucr-201?
3._____Calculate the number of protons of the atom with mass number 19 and 10 neutrons.
4._____Caluclat the number of electron s of the with am mass number of 75 and 42 neutrons.
5. How did the results of the fold foil experiment lead Rutherford to recognize the existence of atomic nuclei?
- Explain why atoms are neutral.
7._____Which has less mass: an electron or a proton?
8. What information about an atom is provided by the atom’s atomic number? The atom’s mass number?
9. Write the complete nuclear symbols for isotopes of uranium that have 142 neutrons, 143 neutrons, and 146 neutrons.
10. _____Write the nuclear symbol and hyphen notation for two isotopes of carbon. Both isotopes have six protons. One isotope has six neutrons, while the other has seven neutrons.
11._____All barium atom have 56 protons. One isotope of barium has 74 neutrons, and another isotope has 81 neutrons. Write the nuclear symbols for these two isotopes of barium.
12._____Precidt which isotope of nitrogen is more commonly found, nitrogen-14 or nitronge-15.
13._____Write the nuclear symbol for the following: 25 protons, 28 electrons, and 30 neutrons.
14. Explain why different atoms of the same element always have the same atomic number but can have different mass numbers.
15. What is an ion?
16. What are the charges of an electron, a proton, and a neutron?
17. State the law of conservation of mass, law of determine proportions, and law of multiple proportions.
18. Calculate the atomic mass for each of the following elements assuming that each consists of the isotopic mixture shown.
(A)99.76% Oxygen-16, 0.04% Oxygen-17, 0.20% Oxygen-18
(B)96.941% Calcium-40, 0.647% Calcium-42, 0.135%Calcium-43, 2.086% Calcium-44, 0.004% Calcium-46, 0.187% Calcium-48
(C)51.83% Silver-107, 48.175 Silver-109