Isotopes (Atomic Number, Mass Number, and Number of Electrons Protons, and Neutr

Question

Isotopes (Atomic Number, Mass Number, and Number of Electrons Protons, and Neutrons)

For istotopes how do I solve the following two problems to obtain its Atomic Number, Mass Number, and Number of Electrons, Protons, and Neutrons

(a Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope 81 bromine-81 Br 35 Select the combination which lists the correct atomic number. number of neutrons. and mass number, respectively B. 35, 81, 46 A. 35, 46, 81 C. 81, 46, 35 D. 46, 81, 35 E. 35, 81, 116 An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? proton, n neutron, e electron) A. 15 p, 16 n, 15 e B. 16 p, 15 n, 16 e C. 16 p. 31 n, 16 e E. 16 p, 16 n, 15 e D. 32 p, 31 n, 32 e

Explanation / Answer

a)

atomic number = 35 (number of lower end)

mass number = 81 (number at higher end)

number of neutron = mass number - atomic number

= 81 - 35

=46

Answer: A

b)

atomic number of S = 16

number of proton = atomic number = 16

number of electron = atomic number = 16

mass number = 31

number of neutron= mass number - atomic number

= 31 - 16

= 15

Answer: B

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