Lesson Worksheet: Ions Science

In this worksheet, we will practice describing ions, writing symbols for ions, and predicting whether an atom will form a positive or negative ion.


What is the correct pairing of the terms and descriptions shown in the boxes below?

  • A1C, 2A, 3B
  • B1A, 2B, 3C
  • C1B, 2A, 3C
  • D1B, 2C, 3A
  • E1A, 2C, 3B


Which of the following ions has a different number of electrons from the others? The table below gives the atomic number for the five elements.

Element Carbon Nitrogen Oxygen Fluorine Sodium
Atomic Number 6 7 8 9 11
  • AO2
  • BC4+
  • CNa+
  • DN3
  • EF


Fill in the blank: A positive ion is an atom that has .

  • Agained a proton from its nucleus
  • Bgained one or more electrons
  • Clost one or more electrons
  • Dlost a proton from its nucleus
  • Ean equal number of electrons and protons


Atoms are likely to lose or gain electrons to obtain a full outer electron shell, forming ions in the process. What is the maximum number of electrons that can occupy the L energy level?


An atom of lithium can lose 1 electron to form one lithium ion. What is the correct symbol notation for this ion?

  • ALi+
  • BLi
  • C+Li1
  • DLi+
  • ELi


An ion has the symbol notation Be2+. How many electrons have been lost or gained to form this ion?

  • A2 lost
  • B2 gained
  • C1 lost
  • D1 gained


The compound magnesium bromide (MgBr2) contains one magnesium ion and two bromide ions. The compound is electrically neutral. If magnesium forms a 2+ ion, what is the charge on a single bromide ion?


The electronic configuration for an atom of neon is shown below. Why do atoms of neon not usually form ions?

  • ANeon is neither a metal or a nonmetal.
  • BThe nucleus of neon atoms contains too many neutrons.
  • CAtoms of neon already have a full outer shell.
  • DNeon exists as a gas, and gases do not form ions.
  • EAtoms of neon lose a proton to form atoms of fluorine instead.


The electronic configurations for an atom and its ion are shown below. Is this atom a metal or a nonmetal?

  • AMetal
  • BNonmetal


The energy level diagram below shows the electronic configuration for an atom. How many electrons does the atom need to lose in order to gain a full outer shell?

  • A1
  • B6
  • C2
  • D3
  • E4

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