Chapter 1, Problem 4P

The astronaut then measures the abundance of silicon on the new planet, obtaining the following results: Abundance Mass Isotope (%) (amu) 28 Si 73.71 27.98 29 Si 14.93 28.98 30 Si 11.36 29.97 What is the atomic mass of silicon for this planet? Express your answer to two decimal places, and include the appropriate units. • View Available Hint(s) HẢ ? Value Units Submit

Learning Goal: This question reviews the format for writing an element's written symbol. Recall that written symbols have a particular format. Written symbols use a form like this: 35C1 In this form the mass number, 35, is a stacked superscript. The atomic number, 17, is a stacked subscript. "Cl" is the chemical symbol for the element chlorine. A general way to show this form is: mass number Symbol atomic number It is also correct to write symbols by leaving off the atomic number, as in the following form: 35Cl or mass number Symbol This is because if you write the element symbol, such as C1, you know the atomic number is 17 from that symbol. Remember that the atomic number, or number of protons in the nucleus, is what defines the element. Thus, if 17 protons are in the nucleus, the element can only be chlorine. Sometimes you will only see 35 C1, where the atomic number is not written. Watch this video to review the format for written symbols. In the following table each column…

LEARNING TASK 1: Complete the following sentences by filling in the appropriate word from the list below. Write your answer in the box below. Do not forget to turn in/ hand in your work. Thanks Periodic Table Compound Symbols Carbon Element Pure Letters Properties Atomic Number Mendeleev Carbon Dioxide Metal 1. cannot be separated by physical or chemical means. 2.Elements are abbreviated with which consist of one or two 3. Elements are organized on the according to their 4. Two or more elements chemically combined make up a 5.. is an example of an element and is an example of a compound. 6. Elements and compounds are called have a unique set of chemical and physical substances because they

https://bbhosted.cuny.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_1347846_1&course_id=_12509.. * Question Completion Status: QUESTION 1 An element is a substance that is made of a single type of atom. All atoms of the same element will have the same physical and chemical properties. O both sentences are true O both sentences are false O the first sentence is true: the second is false the first sentence is false; the second is true QUESTION 2 Each element: O has unique physical properties O has unique chemical properties O is made of a single type of atom O all of the above. QUESTION 3 10 This is the correct sorting of major elements in the human body from the most abundant (in percentage) to the least abundant: O Oxygen; carbon; hydrogen; nitrogen O Oxygen; hydrogen; carbon; nitrogen O Carbon; oxygen; hydrogen; nitrogen O Carbon; hydrogen; oxygen; nitrogen Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers search (72…

The firs 20 Periodic table elements description.

Row 2: Your answer is incorrect. olo There are only two naturally-occuring stable isotopes of boron, the masses of which are listed in the table below. Use whatever data you need from the ALEKS Periodic Table to calculate the natural abundance of each isotope and complete the table. 10. 11 Ar Round your entry for "B to 3 significant digits and your entry for "B to 3 significant digits. mass natural isotope x10 (amu) abundance 10B % 10.013 11.009

What is the chemical formula for a molecular model with 2 nitrogen atoms and 4 hydrogen atoms? Also what is the chemical formula for a molecular model with 2 oxygen atoms and 2 hydrogen atoms? I'm referring to C and D.

II. COMPLETING THE TABLE. Fill in the gaps in the following table. Follow the number sequence indicated in the parenthesis,( ), to answer the missing data. (10 points) Number of neutrons Number of electrons (3) 88 (8) (10) Number of Atomic number 30 Mass number (1) 226 Atom protons (2) (5) (7) 35 35 Zn Ra Fes (4) 26 (6) (9) 45 56 Br 35 80

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