b. Br belongs to the halogen family. List of isotopes. Bromine belongs to the group – 17, period – 4, and block – p. Bromine electron configuration is [Ar] 3d¹⁰ 4s² 4p⁵, and its atomic number is 35. 35 c. 122 d. 6.02 × 1023 e. 87 . It is a chemical element and it is a member of group 17 and period 4 in the periodic table. Empirical Formula (Hill Notation) Br 2. Its melting point is −7.2°C, 19°F, 266 K and boiling point is 58.8°C, 137.8°F, 332 K. The relative atomic weight is 79.904, and it has a density of (g cm-3) 3.1028. . Answer. Two of them, 79Br and 81Br, are stable. Bromine (35 Br) has two stable isotopes, 79 Br and 81 Br, and 30 known radioisotopes, the most stable of which is 77 Br, with a half-life of 57.036 hours. Natural salt deposits and brines are the main sources of bromine and its compounds. Molecular Weight 159.81 . Bromine-79 atom is the stable isotope of bromine with relative atomic mass 78.918338, 50.69 atom percent natural abundance and nuclear spin 3/2. b) Identify the isotopes that will undergo β decay, positron (β+) emission, or both. a) Identify the isotopes as neutron poor, neutron rich, or neither. Bromine has atomic number 35 so all bromine atoms have 35 protons and, therefore, 35 electrons to balance (or it would be an ion). Atomic Number of Bromine. Want to get help with all your chem 132 tasks? The chemical symbol for Bromine is Br.. Atomic Mass of Bromine. Bromine reagent grade CAS Number 7726-95-6. Bromine Br Element 35 Mass Number: 80 Atomic weight: 79.904 g/mol Atomic number (Z): 35 Electrons: 35 Protons: 35 Neutrons: 45 Period: 4 Group: 17 Block: p Select one: a. Atomic number of bromine is 35 and it is indicated by symbol is Br. How many electrons are present in a bromine atom with a mass number of 87? MDL number MFCD00010896. Given: isotopic mass of lead = 208 Find: notation for the isotope Solution: Atomic number = 82 Mass number = isotopic mass = 208 Answer: Pb 82 208 2.10. The mass number is 80 so the rest of the mass … A halogen with the atomic symbol Br, atomic number 35, and atomic weight 79.904. Chlorine, Iodine and Astatine are the other elements in the halogen family. Atomic mass of Bromine is 79.904 u. Thallium has two naturally occurring isotopes, 203 Tl and 205 Tl and has an average atomic mass of 204.39 u. Tl-205 has an abundance of 70.48%. 2.9. Post your Question Now, It’s free to post, cheap for you, and easy to hire. Bromine has isotopes with mass numbers 74 through 90. An isotope of lead has an isotopic mass of 208. Bromine, chemical element, a deep red noxious liquid, and a member of the halogen elements, or Group 17 of the periodic table. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. 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