Worksheet: The Structure of the Atom

In this worksheet, we will practice describing interactions between protons and neutrons in the atomic nucleus and electrons in the surrounding shells.

Q1:

How many neutrons does the isotope 2913Al contain?

Q2:

Protons and neutrons are examples of which type of particle?

  • AQuark
  • BNucleon
  • CLepton
  • DNuclide
  • ENucleus

Q3:

When the distance between atoms is less than the equilibrium bond length, the energy increases. What is the main cause of this effect?

  • ARepulsion between electrons
  • BRepulsion between the positive nuclear charges
  • CDistortion of the optimum orbital geometries
  • DThe Pauli exclusion principle
  • ECollision between nuclei

Q4:

An isotope has atomic number 26, mass number 58 and a charge of 2+.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

What is the chemical symbol for this element?

  • A N i
  • B C r
  • C F e
  • D G e
  • E C e

Q5:

An ion contains 13 protons and 10 electrons.

What is the chemical symbol for this element?

  • A A l
  • B V
  • C C o
  • D L i
  • E N e

What is the charge of the ion?

  • A3+
  • B2+
  • C 3
  • D 2
  • E0

Q6:

An ion contains 34 protons and 36 electrons.

What is the chemical symbol for this element?

  • A G e
  • B K r
  • C S e
  • D Y b
  • E E r

What is the charge of the ion?

  • A0
  • B 2
  • C1+
  • D2+
  • E 1

Q7:

An isotope has symbol 7+Li.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q8:

An isotope has symbol 1254+Te.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q9:

An isotope has symbol 109Ag.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q10:

An isotope has symbol 153N.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

Q11:

An isotope has atomic number 53, mass number 127 and a charge of 1.

How many protons does the isotope contain?

How many neutrons does the isotope contain?

How many electrons does the isotope contain?

What is the chemical symbol for this element?

  • A X e
  • B W
  • C T a
  • D I
  • E T e

Q12:

An ion of platinum has mass number 195 and contains 74 electrons.

How many protons does the ion contain?

How many neutrons does the ion contain?

What is the charge of the ion?

  • A0
  • B 4
  • C 2
  • D4+
  • E2+

Q13:

The structural formula of carbon dioxide is OCO.

What is the empirical formula?

  • A C O
  • B C O 2
  • C C O 2 2
  • D C O 1 / 2

What is the molecular formula?

  • A C O 1 / 2
  • B C O 2 2
  • C C O
  • D C O 2

Q14:

An ion has the electron configuration 1s2 2s2 2p6 3s2 3p6. Which of the following pieces of information would not allow this ion to be precisely identified?

  • AIonic radius
  • BAtomic number
  • CIonization energy
  • DCharge
  • EAtomic mass

Q15:

Which particles do isotopes of an element always contain different numbers of?

  • ANeutrons
  • BProtons
  • CNuclei
  • DPositrons
  • EElectrons

Q16:

Which of the following properties cannot vary between isotopes of the same element?

  • AAtomic number
  • BNucleon number
  • CBinding energy
  • DCharge
  • EMass number

Q17:

Which term describes two atoms with different atomic numbers but the same number of neutrons?

  • AIsotones
  • BIsotopes
  • CIsodiaphers
  • DIsobars
  • ENuclear isomers

Q18:

Which term is defined as the sum of the number of protons and neutrons in an atom?

  • AAtomic number
  • BMass number
  • CNuclear mass
  • DMass excess
  • ERelative atomic mass

Q19:

Which of the following is the best definition of the wave function of an atomic orbital?

  • AA surface connecting points of equal electron density around an atomic nucleus, containing a maximum of two electrons
  • BA mathematical function describing the wave-like behavior of either one or a pair of electrons in an atom
  • CThe space around an atomic nucleus in which either one or a pair of electrons are most likely to be found
  • DThe probability density of finding either one or a pair of electrons in the space around an atomic nucleus
  • EA shell of electron density located at a fixed distance from an atomic nucleus, containing a maximum of two electrons

Q20:

Which term is defined as the space around an atomic nucleus which, for an isolated atom, is occupied by all electrons possessing the same potential energy?

  • ASubshell
  • BOrbital
  • CCovalent bond
  • DLone pair
  • EShell

Q21:

Which term is defined as the number of mutually orthogonal atomic orbitals possessing the same potential energy?

  • AOrbital degeneracy
  • BOrbital parity
  • COrbital angular momentum
  • DAzimuthal quantum number
  • EPrincipal quantum number

Q22:

What are the basic components of an atom?

  • AProtons, neutrons, and electrons
  • BPhotons, neutrons, and electron neutrinos
  • CProtons, neutrinos, and electrons
  • DPhotons, neutrons, and electrons
  • EProtons, neutrons, and electron neutrinos

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