Question

Write the symbol for each of the following ions: (a) the ion with a 3+ charge, 28 electrons, and a mass number of 71 (b) the ion with 36 electrons, 35 protons, and 45 neutrons (c) the ion with 86 electrons, 142 neutrons, and a 4+ charge (d) the ion with a 2+ charge, atomic number 38, and mass number 87

Answer 1

Answer:

$\boxed{\math{_{31}^{71}\text{Ga}^{3+}}}\boxed{\math{_{35}^{80}\text{Br}^{-}}} \boxed{\math{_{90}^{232}\text{Th}^{4+}}} \boxed{\math{_{38}^{87}\text{Sr}^{2+}}}$

Explanation:

(a)

If the ion has 28 electrons and a 3+ charge, it normally has 31 electrons. It must also have 31 protons. Atom 31 is gallium.

$\text{The symbol for the ion is }\boxed{\mathbf{_{31}^{71}\textbf{Ga}^{3+}}}$

(b)

If the ion has 35 protons, it normally has 35 electrons. It has 36 electrons, so it has a negative charge.  Atom 35 is bromine.

A = p + n = 35 + 45 = 80, so the isotopic mass number is 80

\text{The symbol for the ion is }\boxed{\mathbf{_{35}^{80}\textbf{Br}^{-}}}

(c)

If the ion has 86 electrons and a charge of 4+, it normally has 90 electrons. It must also have 90 protons. Atom 90 is thorium.

A = p + n = 90 + 142 = 232, so the isotopic mass number is 232.

$\text{The symbol for the ion is }\boxed{\mathbf{_{90}^{232}\textbf{Th}^{4+}}}$

(d)

If the ion has 38 protons, it is strontium.

$\text{The symbol for the ion is }\boxed{\mathbf{_{38}^{87}\textbf{Sr}^{2+}}}$

Answer 2

The symbol of ion will be:$^{71}_{31}Ga^{+3}$

The symbol of ion will be:$^{80}_{35}Br^{-1}$

The symbol of ion will be:$^{232}_{90}Th^{+4}$

The symbol of ion will be:  $^{87}_{38}Sr^{+2}$

Explanation:

The symbol of an ion of an element is written as:

$^A_ZX^C$

Where:

A = Mass number of the atom

Z = Atomic number of the atom

X = Symbol the atom

C = Charge on the atom

Given:

a) The ion with a 3+ charge, 28 electrons, and a mass number of 71.

b) The ion with 36 electrons, 35 protons, and 45 neutrons

c) The ion with 86 electrons, 142 neutrons, and a 4+ charge

d) The ion with a 2+ charge, atomic number 38, and mass number 87

To find:

The symbols of given ions

Solution:

a)

Charge on the ion = C = 3+

Number of electrons in the ion = 28

Number of electrons in ion's parent atom = 28 +3 = 31

Number of electrons in parent atom = Number of proton in ion/ paarent atom

= 31 = 31

Atomic number = Number of protons

Atomic number of the ion = Z = 31

Mass number of ion = A = 71

The element with atomic number 31 is gallium with the chemical symbol Ga, so the symbol of ion will be:

$^{71}_{31}Ga^{+3}$

b)

Charge on the ion = C = ?

Number of electrons in the ion = 36

Number of protons in the ion = 35

Number of neutrons = 45

Number of electrons in parent atom = Number of protons in ion/ parent atom

= 35 = 35

Atomic number = Number of protons

Atomic number of the ion = Z = 35

Number of electrons in ion's parent atom = Number of protons in the ion = 35

Charge on the ion = C = 36 - 35 = 1-

Mass number of ion = Number of protons + Mass of neutrons

A = 35 + 45 = 80

The element with atomic number 35 is bromine with the chemical symbol Br, so the symbol of ion will be:

$^{80}_{35}Br^{-1}$

c)

Charge on the ion = C = 4+

Number of electrons in the ion = 86

Number of electrons in ion's parent atom = 86+4 = 90

Number of electrons in parent atom = Number of protons in ion/ parent atom

= 90= 90

Atomic number = Number of protons

Atomic number of the ion = Z = 90

Number of neutrons = 142

Mass number of ion = Number of protons + Mass of neutrons

A = 90+ 142 = 232

The element with atomic number 90 is thorium with the chemical symbol Th, so the symbol of ion will be:

$^{232}_{90}Th^{+4}$

d)

Charge on the ion = C = 2+

Atomic number of the ion = Z = 38

Mass number of ion = A = 87

The element with atomic number 38 is strontium with chemical symbol Sr, so the symbol of ion will be:

$^{87}_{38}Sr^{+2}$

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