Concept explainers
(a)
Interpretation:
An element in Group
(b)
Interpretation:
An element in the fifth period has to be named using the periodic table.
(c)
Interpretation:
The element that is present in the sixth period and in Group
(d)
Interpretation:
The element that is present in the third period and in Group
(e)
Interpretation:
An alkali metal that is present in the third period has to be given using the periodic table.
(f)
Interpretation:
The noble gas that is present in the fifth period has to be given using the periodic table.
(g)
Interpretation:
The element that is present in Group
(h)
Interpretation:
The metalloid present in Group
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OWLV2 FOR MOORE/STANITSKI'S CHEMISTRY:
- Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the universe. (a) The radius of a helium atom is 3.1x10-11 m; the radius of its nucleus is 2.5x10-15 m. What fraction of the spherical atomic volume is occupied by the nucleus (V of a sphere 5 4/ 3πr3)? (b) The mass of a helium-4 atom is 6.64648x10-24 g, and each of its two electrons has a mass of 9.10939x10-28 g. What fraction of this atom’s mass is contributed by its nucleus?arrow_forwardgroup and period. (a) Group 4A/14, Period 3; (b) Group 4A/14, Period 2; (c) Group 1B/11, Period 4; (d) Group 2A/2, Period 3. 42. I Write the atomic number of the element in each givenarrow_forward(d) the ion with 74 electrons, 116 neutrons, and a +3 chargearrow_forward
- Write the symbol for each of the following ions. (Enter your answer in the form A X q± Z .) (a) the ion with a 3+ charge, 28 electrons, and a mass number of 69 (b) the ion with 36 electrons, 35 protons, and 44 neutrons (c) the ion with 91 electrons, 148 neutrons, and a 4+ charge (d) the ion with a 2+ charge, atomic number 40, and mass number 90arrow_forward7. Isotopes. (a) Argon has three naturally occurring isotopes, 36Ar, 38Ar, and 40Ar. What is the mass number of each? How many protons, neutrons, and electrons are present in each? (b) Gallium has two naturally occurring isotopes, 6°Ga (isotopic mass = 68.9256 amu, abundance 60.11%) and 71Ga (isotopic mass = 70.9247 amu, abundance = 39.89%). Calculate the atomic mas of gallium.a %3D (c) Chlorine has two naturally occurring isotopes, 35CI (isotopic mass = 34.9689 amu) and 3"Cl (isotopic mass = 36.9659 amu). If chlorine has an atomic mass of 35.4527 amu, what is the percent abundance of each isotope?arrow_forward3. (a) Magnesium oxide was formed when the metal burns in air. (i) If 1.25 g of magnesium oxide contains 0.754 g of magnesium, determine the mass ratio of magnesium magnesium oxide. (ii) Calculate the weight of magnesium in 534 g of magnesium oxide.arrow_forward
- (b) A certain element has two naturally occurring isotopes. The mass of one of the isotopes is 106.905 amu and its natural abundance is 51.60%. The mass of the second isotope is 108.883 amu. Calculate the average atomic mass Write the chemical symbols of the isotopesarrow_forwardWhich of the highlighted elements in Figure P2.7 is (a) a reactive nonmetal, (b) a chemically inert gas, (c) a reactive metal?arrow_forwardLook up the following information for the element iridium: (i) number of protons, neutrons, and electrons; (ii) atomic number and average atomic mass; (iii) the charge of the anion(s) or cation(s) that it commonly forms; (iv) the mass of its two most common isotopes and the number of protons and neutrons in each one. Also, comment briefly on the presence of this element in meteorite craters and the significance of this observation.arrow_forward
- 88 and 89 pleasearrow_forward(1) The element gallium (Ga) exists in two isotopic forms with the following abundances: 60.16% 69Ga and 39.84% 71Ga. Calculate the atomic mass of gallium. (The exact iso-topic mass of 69Ga is 68.9257. The exact isotopic mass of 71Ga is 70.9249.) (2) The element carbon (C) exists in two isotopic forms with the following abundances: 98.89% 12C and 1.11% 13C. Calculate the atomic mass of carbon.arrow_forwardTwo radioactive isotopes of iodine used for the diagnosis and treatment of thyroid disease have mass numbers of 123 and 131. For each isotope, give the following information: (a) the number of protons; (b) the number of neutrons; (c) the number of electrons in the neutral atom; (d) the group number.arrow_forward
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