Verizon LTE 8:53 PM Course Home Mast Chapte × https://session.masteringchemistry

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Verizon LTE 8:53 PM Course Home Mast Chapte × https://session.masteringchemistry.com/myct/item Chapter 06 Homework Problem 6.147 2 o 10> Complebe the following table for atoms or ions Atom or lon | Number of Protons | rter of Electrons Electrons LostGained Ca2 12 10 e +2 e (gained) 3 e lost) 10 e PartA Part B Part C Part D Write the lon (atom) that has 12 protons and 10 electrons. Express your answer as a chemical symbol or an ion Part E This question will be shown after you complete previous questions). Part F Webe the ion (atom) that has 8 protons and has gained 2 electrons Express your answer as a chemical symbol or an ion. Part G This question will be shown after you complate previous question(s).

Explanation / Answer

Calcium atomic number = 20

when calcium is neutral, atomic number = number of electrons = 20

It is given calcium with positive charge 2 which means two electrons are lost

number of electrons lost = 2

number of electrons present in Ca2+ = 18

number of protons = atomic number = 20 (proton number wont change with charge)

12 protons = aomic number = 12

element with atomic number 12 = Mg

given number of electrons present = 10

number of electrons lost = atomic number - number electrons present = 12-10 =2

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Part D

an atom has 12 protons

So atomic number = 12 (Mg)

this atom has only 10 electrons which means 2 electrons are lost

So it is an ion : Mg2+

Part F

number of protons = 8

so the atom is = O

it has gained 2 electrons so charge would be = -2

the ion symbol = O2-

atom/ion # protons # electrons electron lost/gained Ca2+ 20p+ 18e- -2e- lost Mg+2 12 10 -2e- lost O2- 8 10 +2e- gained Al+3 13 10e- -3e- lost

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