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Write the symbol for each of the following ions:
(a) the ion with a 1+ charge, atomic number 55, and mass number 133
(b) the ion with 54 electrons, 53 protons, and 74 neutrons
(c) the ion with atomic number 15, mass number 31, and a 3 - charge
(d) the ion with 24 electrons, 30 neutrons, and a 3+ charge

Respuesta :

Explanation:

Atomic number means total number of protons present in an element. Whereas mass number or atomic mass means the sum of total number of protons and neutrons in an atom or element.

When an atom is neutral then it contains same number of protons and electrons.

Symbol for any element showing atomic number and atomic mass is [tex]^{\text{Atomic mass}}_{\text{atomic number}}X[/tex].

(a) the ion with a 1+ charge, atomic number 55, and mass number 133 will be Cesium and it is represented as [tex]^{133}_{55}Cs^{+}[/tex].

(b) the ion with 54 electrons, 53 protons, and 74 neutrons will have mass number as (53 protons + 74 neutrons) = 127. Iodine is the element that has mass number 127. There will be a negative charge also as it contains 54 electrons.

Hence, symbol for this element will be [tex]^{127}_{53}I^{-}[/tex].

(c) the ion with atomic number 15, mass number 31, and a 3 - charge will be phosphorous. Symbol for this element will be [tex]^{31}_{15}P^{3+}[/tex].        

(d) the ion with 24 electrons, 30 neutrons, and a 3+ charge in elemental state will have in total 27 electrons and 30 neutrons. So, its mass number will be (27 + 30) = 57. Symbol of this element will be [tex]^{57}_{15}Co^{3+}[/tex]  

pstnonsonjoku

Ions are formed when atoms gain or loose electrons.

An ion is formed when an atom looses or gains electrons. An ion is positive if the atom lost electron while ion is negative when the atom gains electrons. To find the symbol of each ion, we must identify the element that has the atomic number listed and write down its symbol.

  • The element Cs has atomic number 55. If it looses one electron and has a charge of +1, the symbol of the ion is Cs^+.
  • The number of protons of an atom is the same as the atomic number. The element that has atomic number 53 is I. The charge on an tom is calculated from; number of protons - number of electrons. This gives us, 53 - 54 = -1. The symbol of the ion is I^-.
  • The element with atomic number 15 is phosphorus. The symbol of the ion is P^3-.
  • If the ion has 24 electrons, 30 neutrons with a charge of +3, the number of protons in the ion is obtained from; charge = number of protons - number of electrons. Hence, number of protons = charge + number of electrons. So, number of protons = 3 + 24 = 27. The element with atomic number 27 is Co and the symbol of the ion is Co^3+.

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