Guided course 01:44The difference between atomic numbers and atomic mass.Johnny Betancourt4458views114rank2comments
Guided course 02:54Three rules about orbitals you need to know.Johnny Betancourt2654views57rank1comments
Multiple ChoicePRACTICE: Determine the number of protons, neutrons and electrons in the following atoms.1007views8rank1comments
Multiple ChoicePRACTICE: Determine the number of protons, neutrons and electrons in the following atoms.1372views16rank5comments
Multiple ChoicePRACTICE: Determine which of the three principles of electron configuration is being broken in the electron diagrams below.1052views12rank4comments
Multiple ChoicePRACTICE: Determine which of the three principles of electron configuration is being broken in the electron diagrams below.1304views12rank5comments
Textbook QuestionNitrogen has relatively stable isotopes of mass numbers 13, 14, 15, 16, and 17. Calculate how many protons and neutrons are in each of these isotopes of nitrogen.747views
Textbook QuestionDraw the ground-state electronic configuration for each of the following: b. Ca2+524views
Textbook QuestionDraw the ground-state electronic configuration for each of the following: a. Mg589views
Textbook QuestionChlorine has two isotopes, Cl35 and Cl37; 75.77% of chlorine is Cl35, and 24.23% is Cl37. The atomic mass of Cl35 is 34.969 amu, and the atomic mass of Cl37 is 36.966 amu. What is the atomic mass of chlorine?4232views
Textbook QuestionName the element that corresponds to each electronic configuration. a. 1s^2 2s^2 2p^2 b. 1s^2 2s^2 2p^4 c. 1s^2 2s^2 2p^6 3s^2 3p^3 d. 1s^2 2s^2 2p^6 3s^2 3p^5485views
Textbook Questiona. Write the ground-state electronic configuration for chlorine (atomic number 17), bromine (atomic number 35), and iodine (atomic number 53).431views
Textbook QuestionOxygen has three isotopes, O16, O17, and O18. The atomic number of oxygen is 8. How many protons and neutrons does each of the isotopes have?842views
Textbook Questiona. How many protons do the following species have? (See the periodic table inside the back cover of this book.) b. How many electrons does each have? 1. Na+ 2. Ar 3. Cl-381views
Textbook QuestionWrite the electronic configurations of the third-row elements shown in the partial periodic table in Figure 1-6538views
Textbook QuestionChlorine exists as one of two isotopes with atomic masses of 34.969 amu (³⁵Cl) and 36.966 amu (³⁷Cl) . Calculate the relative abundance of ³⁵Cl and ³⁷Cl based on the average atomic mass of 35.453 amu.520views
Textbook QuestionBromine-79 (50.7% abundance) has an atomic mass of 78.918 amu, whereas bromine-81 (49.3% abundance) has an atomic mass of 80.916 amu. From these data, calculate the average atomic mass of bromine that you would expect to see in the periodic table.458views
Textbook QuestionA chemistry student drew the following incorrect electron configuration for carbon. (b) Which rule wasn't followed by the student? 500views
Textbook QuestionWhy do elements in the same group of the periodic table display similar reactivity?389views
Textbook QuestionHow many electrons does an atom of each of the following elements need to lose to achieve a noble gas configuration? By losing that many electrons, which noble gas configuration is achieved? (a) Beryllium396views
Textbook QuestionHow many electrons does an atom of each of the following elements need to gain to achieve a noble gas configuration? By gaining that many electrons, which noble gas configuration is achieved? (a) Oxygen465views
Textbook QuestionHow many electrons does an atom of each of the following elements need to gain to achieve a noble gas configuration? By gaining that many electrons, which noble gas configuration is achieved? (c) Phosphorus441views
Textbook QuestionA chemistry student drew the following incorrect electron configuration for carbon. (a) Correct the diagram.357views
Textbook QuestionWould you expect electrons in the 2s or 3s orbital to be more reactive? Why?279views
Textbook QuestionWhat is the ground state electron configuration of carbon? How many bonds does carbon usually form?561views
Textbook QuestionIn the periodic table, the number 79.904 appears under the element bromine. What is the significance of this number?351views
Textbook QuestionGive the charge most likely to result from ionization of the following metals.(c) Potassium332views
Textbook QuestionHow many electrons does an atom of each of the following elements need to lose to achieve a noble gas configuration? By losing that many electrons, which noble gas configuration is achieved?(d) Potassium313views
Textbook QuestionHow many electrons does an atom of each of the following elements need to gain to achieve a noble gas configuration? By gaining that many electrons, which noble gas configuration is achieved?(b) Iodine296views
Textbook QuestionWhy is argon considered to be so stable that it is referred to as a noble gas?328views
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