Read each description in the first column of the table below. If any chemical element with atomic number of 92 or less matches the description, check Yes and enter the chemical symbol of an element that matches. Otherwise check No in the second column. description An element in Period 4 and Group 3A. A semimetal in Group 5A. A halogen with a higher atomic number than lead. A transition element in Period 5. Does any element with Z ≤ 92 match the description? Yes O Yes Yes Yes O No O No O No O No If you checked yes, give the symbol of an element with Z ≤ 92 that matches. X 0 3

In which group on the periodic table is Iron? O Alkali metal O Halogen O Alkaline earth metal Transition metal O Noble gas

12, Which of the statements is not correct about the element germanium? Group of answer choices A, It is a metal. B, It is in group 4A. C,It has properties most similar to siicon. D, It is in period 4. 5.  If two atoms have the same number of protons, but the different number of neutrons, they have the same: Group of answer choices A, chemical properties B, atomic mass C, mass number D, physical properties

Read each description in the first column of the table below. If any chemical element with atomic number of 92 or less matches the description, check Yes and enter the chemical symbol of an element that matches. Otherwise check No in the second column. description An element in Period 3 and Group 3A. A semimetal in Group 4A. An element in the nitrogen family with a higher atomic number than silicon. A transition element in Period 6. Does any element with Z ≤ 92 match the description? OYes O Yes Yes O Yes O No O No O No O No If you checked yes, give the symbol of an element with Z ≤ 92 that matches. 0 U 7

Element X has 3 isotopes. What is the average atomic mass? Isotope 1 has a mass of 24 with a %abundance of 20% Isotope 2 has a mass of 26 with a %abundance of 75% Isotope 3 has a mass of 28 with a %abundance of 5% Type your answer.

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Kead each description in the first column of the table below. If any chemical element with atomic number of 92 or less matches the description, check Yes and enter the chemical symbol of an element that matches. Otherwise check No in the second column. description Does any element with Z ≤ 92 match the description? If you checked yes, give the symbol of an element with Z ≤ 92 that matches. An element in Period 3 and Group 5A. Yes No A nonmetal in Group 6A. Yes No An alkaline earth metal with a higher atomic number than silicon. O Yes O No A main-group element in Period 4. O Yes No O ☐

1- For each of the following atoms, calculate the number of protons and neutrons in the nucleus and the number of electrons outside the nucleus (assume neutral atoms). element number of number of number of electrons mass number (A) symbol 126C protons (Z) neutrons 12 10 12 10 14 27 10 23,1Na 11 17 18 2- Calculate the atomic mass to four significant figures for carbon, given the following data: Isotope Exact Atomic Mass (amu) 12.00000 13.00335 Abundance in Nature (%) 98.89 1.110 12C 13C

Part A Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78.99%, 10.00%, and 11.01%, respectively. Calculate the atomic mass of magnesium. Express the atomic mass in atomic mass units to two decimal places. ΑΣφ ? atomic mass = amu Request Answer Submit Part B Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11% and Ga-71. Use the atomic mass of gallium from the periodic table to find the mass of Ga-71. Express the mass in atomic mass units to two decimal places. ν ΑΣφ ? mass = amu

Periodic table The periodic table lists two main numbers for each element. The atomic number is an integer that equals the number of protons. The number of neutrons is not given in the periodic table because it will vary with different isotopes. The mass number of an element is the sum of the protons and neutrons. To find the number of neutrons, the atomic number must be subtracted from the mass number. Elemental symbol When writing the symbol for an element, a superscript indicates the mass number and a subscript indicates the atomic number. For example, Chas a mass number of 14 and an atomic number of 6. This isotope can also be written as just ¹4C. You do not need to put in the 6 because the atomic number of carbon is always 6 regardless of which isotope you are dealing with. Part B . . Part A VE ΑΣΦ How many neutrons are found in one atom of 59 Co? Express your answer numerically. View Available Hint(s) A certain element X has four isotopes. number Elemental symbol When writing the…