Forming Ions

Cobalt is a transition element.

A particle of cobalt contains 24 electrons and has a nucleon number of 60.

Which statement about this particle is correct?

• It is a 3⁺ ion.

• It is a 3^- ion.

• It contains 24 neutrons.

• It contains 24 protons.

Which ion has the most shells that contain electrons?

• Al³⁺

• Be²⁺

• N^3–

• S^2–

The ion Q²⁺ has three complete shells of electrons.

What is Q?

• calcium

• magnesium

• oxygen

• sulfur

What are cations? and how to form cations? (you may choose more than one answers)

• Negative ions

• Positive ions

• lose outer electrons

• Gain outer electrons

What is outer electron called?

• Anion

• Cation

• Ions

• Valence electron

An ion contains 20 protons, 20 neutrons and 18 electrons. By referring to the Periodic Table, What is the charge on the ion?

• -2

• +2

• 0

• 8

Which is the correct diagram showing the formation of an ion from the diagram below?

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Atoms of elements (except the noble gas) are reactive?

• They have fully filled outer shells

• They do not have fully filled outer shells

• They lose their outer electrons

• They gain their outer electrons