Chemistry

Chemistry, 29.07.2019 17:00, lilly9240

Which is the correct symbol for the atom with 42 protons and 49 neutrons?

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Biology, 07.07.2019 11:30, travashouston4873

1)if a boron atom has 5 protons, 6 neutrons, and 5 electrons, it has a mass of a)11 b)10 c)6 2)the atomic number of an atom is the total number of in the nucleus. a)protons and electrons b)protons c)neutrons 3)a lithium atom has 3 protons, 3 neutrons, and 3 electrons. which of the following sets of particles represents and isotope of this atom? a)4 protons, 3 neutrons, and 4 electrons b)3 protons, 4 neutrons, and 3 electrons c)4 protons, 4 neutrons, and 4 electrons

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Which of the following is correct concerning subatomic particles? a) the electron was discovered by goldstein in 1886. b) the neutron was discovered by chadwick in 1932. c) the proton was discovered by thomson in 1880. d) cathode rays were found to be made of protons. how many neutrons and protons does a neutral atom of sodium with an atomic mass number of 23 have? a) 22 neutrons; 11 protons b) 23 neutrons; 11 protons c) 11 neutrons; 11 protons d) 12 neutrons; 11 protons

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Chemistry, 28.07.2019 03:50, manco6

5questions to answer 1) electrons are transferred in the formation of bonds. a) ionic b) covalent c) metallic d) all chemical 2) which pair below describes isotopes of the same element? a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons 3) describe the composition of the nucleus of an atom. a) it is composed of protons. b) it is composed of protons and neutrons. c) it is composed of protons and electrons. d) it is composed of protons, neutrons, and electrons. 4) reactant → product if there are 4 grams of reactant, how many grams of product are produced by the chemical reaction? a) 0 grams b) 2 grams c) 4 grams d) 8 grams 5) 2na + cl2 → 2nacl sodium and chlorine combine to form table salt. given the chemical reaction, how many grams of 2na + cl2 would be required to produce 4 grams of table salt? a) 2 grams b) 3 grams c) 4 grams d) 8 grams

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Biology, 03.09.2019 19:30, brittanysanders

The most common form of calcium has 20 protons, 20 neutrons, and 20 electrons. which of the following elements would be an isotope of calcium? 1. an atom with 20 protons, 21 neutrons, and 20 electrons 2. an atom with 21 protons, 21 neutrons, and 21 electrons 3. an atom with 21 protons, 20 neutrons, and 21 electrons 4. an atom with 20 protons, 20 neutrons, and 18 electrons 5. all of the listed responses are correct.

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Which is the correct symbol for the atom with 42 protons and 49 neutrons?...

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