Atomic Structure and Periodic Table Quiz
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Questions and Answers

What is the mass number (A) of Carbon-13?

13

How would you denote Tritium using its chemical symbol and mass number?

3H or T

What does the abundance figure indicate for Deuterium?

0.015%

Explain how to calculate the average atomic mass of an element.

<p>Multiply the atomic mass of each isotope by its percent abundance (in decimal) and sum the results.</p> Signup and view all the answers

Identify the isotopes of carbon listed and their corresponding abundances.

<p>Carbon-12 (98.90%) and Carbon-13 (1.10%)</p> Signup and view all the answers

If an isotope has 6 protons and a mass number of 13, how many neutrons does it have?

<p>7</p> Signup and view all the answers

What is the average atomic mass of an element based on its isotopes?

<p>It is a weighted average accounting for the relative abundances of isotopes.</p> Signup and view all the answers

What is the significance of writing the mass number as a superscript next to the chemical symbol?

<p>It denotes the total number of protons and neutrons in that isotope.</p> Signup and view all the answers

Describe the difference between stable and radioactive isotopes using Tritium as an example.

<p>Tritium is radioactive, meaning it decays over time, whereas stable isotopes do not.</p> Signup and view all the answers

What is the definition of an atom?

<p>An atom is the smallest particle of an element that retains the chemical properties of that element.</p> Signup and view all the answers

Name three elements from Group I of the periodic table.

<p>Sodium (Na), Potassium (K), Lithium (Li).</p> Signup and view all the answers

What distinguishes metals from non-metals in terms of conductivity?

<p>Metals conduct electricity, while non-metals do not.</p> Signup and view all the answers

Which group of the periodic table do noble gases belong to?

<p>Noble gases belong to Group VIII.</p> Signup and view all the answers

Identify the primary characteristic of alkaline earth metals.

<p>Alkaline earth metals are found in Group II and are characterized by their reactivity and metallic properties.</p> Signup and view all the answers

What are congeners in the context of the periodic table?

<p>Congeners are elements that belong to the same group or column of the periodic table.</p> Signup and view all the answers

List two transition metals and their position in the periodic table.

<p>Iron (Fe) and Copper (Cu), which are located between Groups II and III.</p> Signup and view all the answers

What is the origin of the symbol for Gold (Au)?

<p>The symbol Au is derived from the Latin word 'aurum'.</p> Signup and view all the answers

What is an element, and how is it represented in the periodic table?

<p>An element is a pure substance made of atoms with the same chemical properties, represented by unique symbols.</p> Signup and view all the answers

Explain the term 's-block' in the periodic table.

<p>'s-block' refers to the group of elements in Groups I and II, which include alkali and alkaline earth metals.</p> Signup and view all the answers

What distinguishes metalloids from metals and non-metals?

<p>Metalloids have a physical appearance and properties of metals but behave chemically like non-metals.</p> Signup and view all the answers

Who discovered the electron and what are its key properties?

<p>The electron was discovered by J.J. Thomson, has a negative charge of $1.6 imes 10^{-19}$ C, and a mass of $9.1 imes 10^{-28}$ g.</p> Signup and view all the answers

What is the significance of the atomic number (Z) in an atom?

<p>The atomic number (Z) represents the number of protons in an atom's nucleus and defines the element.</p> Signup and view all the answers

How does the mass of an atom relate to its isotopes?

<p>Isotopes have the same atomic number but different masses due to varying numbers of neutrons.</p> Signup and view all the answers

Explain isotopic abundance.

<p>Isotopic abundance is the percentage of a specific isotope present in a sample of an element.</p> Signup and view all the answers

What is the average atomic mass of carbon based on the isotopic abundance provided?

<p>12.011 amu</p> Signup and view all the answers

What is the mass number (A) of an atom and how is it calculated?

<p>The mass number (A) is the sum of protons and neutrons in the nucleus, calculated as $A = Z + N$.</p> Signup and view all the answers

Describe the role of the nucleus in an atom.

<p>The nucleus is positively charged and contains protons and neutrons, serving as the atom's core.</p> Signup and view all the answers

Define one atomic mass unit (1 u) in relation to carbon-12.

<p>1 u is defined as 1/12 the mass of a carbon-12 atom.</p> Signup and view all the answers

How many atoms are contained in 1 mole of any element?

<p>6.022 x 10^23 atoms</p> Signup and view all the answers

Who proposed the structure of the atom that includes a nucleus?

<p>The structure of the atom with a nucleus was proposed by Ernest Rutherford.</p> Signup and view all the answers

What happens to the charge of an atom when the number of protons equals the number of electrons?

<p>When the number of protons equals the number of electrons, the atom is electrically neutral.</p> Signup and view all the answers

What is the molar mass of gold (Au) as stated in the content?

<p>196.97 g/mol</p> Signup and view all the answers

What can you infer about Uranium-235's abundance in nature?

<p>Uranium-235 has a natural abundance of only 0.7%, indicating it is relatively rare compared to other isotopes.</p> Signup and view all the answers

If a sample of chlorine weighs 15 g, how many moles of chlorine does it contain?

<p>0.423 mol Cl</p> Signup and view all the answers

What are the mass and number of neutrons in a deuterium atom?

<p>Mass is 2.014 u; it has 1 neutron.</p> Signup and view all the answers

Calculate the mass of one atomic mass unit (1 u) in grams.

<p>1.6605 x 10^-24 g</p> Signup and view all the answers

What is the relationship between molar mass in g/mol and average atomic mass in amu?

<p>They are numerically identical.</p> Signup and view all the answers

Which carbon isotope serves as the standard for atomic mass comparisons?

<p>Carbon-12</p> Signup and view all the answers

What is the number of neutrons in a carbon-13 isotope?

<p>7 neutrons</p> Signup and view all the answers

Study Notes

Atomic Structure

  • Atom: The smallest unit of matter of an element.
  • Element: A substance composed of atoms with the same chemical characteristics.
  • Symbols: Chemical symbols for elements have Latin and German origins, such as:
    • Antimony (Sb), Copper (Cu), Gold (Au), Iron (Fe), Lead (Pb), Mercury (Hg), Potassium (K), Silver (Ag), Sodium (Na), Tin (Sn), Tungsten (W)

Periodic Table

  • Groups: Vertical columns in the periodic table.
  • Periods: Horizontal rows in the periodic table.
  • Congeners: Elements within the same group.
  • Alkali Metals: Group I (Na, Li, K, Rb, Cs).
  • Alkaline Earth Metals: Group II (Be, Ca, Mg, Sr, Ba).
  • Halogens: Group VII (F, Cl, Br, I).
  • Noble Gases: Group VIII (Kr, He, Ne, Xe, Rn).
  • Transition Metals: Located between Groups II and III.
  • Block Classifications:
    • s-block: Groups I and II.
    • p-block: Groups III - VIII.
    • d-block: Transition Metals.
    • f-block: Lanthanides and Actinides

Properties of Substances

  • Metal: Conducts electricity, has a metallic luster, malleable and ductile.
  • Non-metal: Doesn't conduct electricity, not malleable or ductile.
  • Metalloid: Appearance and properties similar to metals but behaves chemically like non-metals (e.g., Si, Ge, As, Te).

Fundamental Particle Properties

  • Electron:
    • Discovered by J.J. Thomson.
    • Carries one negative charge (denoted by e-).
    • Charge = 1.6 x 10^-19 C.
    • Mass = 9.1 x 10^-28 g.
  • Proton:
    • Discovered by James Chadwick.
    • Carries one positive charge (denoted by p).
    • 1836 times heavier than an electron.
    • Located in the nucleus.
  • Neutron:
    • Discovered by James Chadwick.
    • Has no charge.
    • Mass nearly equal to a proton.
    • Located in the nucleus.

Nucleus

  • Proposed by Ernest Rutherford.
  • Positively charged.
  • Contains protons and neutrons.

Atomic Number (Z)

  • Number of protons in the nucleus.
  • Determines the element's identity.
  • Shown above the chemical symbol (e.g., Au, Z = 79).
  • Number of protons equals the number of electrons in a neutral atom.

Mass Number (A)

  • Total number of protons and neutrons in the nucleus.
  • Calculated by adding atomic number (Z) and number of neutrons (N): A = Z + N.
  • Written as a superscript to the left of the chemical symbol (e.g., 35Cl).

Mass of an Atom and Isotopes

  • Atomic Mass: Measured using mass spectrometry (MS).
    • 1H: 1.67 x 10^-24 g.
    • 12C: 1.99 x 10^-23 g.
  • Isotopes: Atoms of the same element (same Z) but with different mass numbers (different number of neutrons).
    • Examples: 1H (Hydrogen), 2H (Deuterium), 3H (Tritium).

Isotopic Abundance

  • Percentage of a particular isotope in a sample of an element.
  • Natural abundance: Abundance in naturally occurring material.
  • Examples:
    • Neon-20: 91% natural abundance.
    • Uranium-235: 0.7% natural abundance.

Average Atomic Mass

  • Relative atomic mass of an element considering the natural abundances of its isotopes.
  • Calculated by multiplying each isotope's exact mass by its percent abundance (expressed as a decimal) and summing the results.
  • Example: Average atomic mass of Carbon = [(12.000000)(0.9890) + (13.003355)(0.0110)] = 12.011 amu.

Relative Atomic Mass

  • One atomic mass unit (1 u) equals 1/12th the mass of a carbon-12 atom.
  • Mass of one carbon-12 atom: 12 u exactly.
  • Mass of one carbon-12 atom = 1.9926 x 10^-23 g.
  • 1 u = (1.99 x 10^-23 g) / 12 = 1.6605 x 10^-24 g.

Mole (mol)

  • SI unit for amount of substance.
  • Contains Avogadro's Number (NA) of particles.
  • NA = 6.02214076(12) x 10^23 mol^-1.
  • 1 mole of any element contains NA atoms.
  • 1 mole of carbon-12 weighs 12 g.

Molar Mass

  • Mass per mole of atoms of an element.
  • Numerically, it's identical to the average atomic mass but has units of g/mol.
  • Examples:
    • 1 mol Au = 196.97 g.
    • 1 mol Cu = 63.54 g.
    • 1 mol Hg = 200.59 g.
  • Calculating the number of moles: Number of moles = (mass of sample) / (mass of one mole of the substance).
    • Example: 15 g Cl = (15 g) / (35.45 g/mol) = 0.423 mol Cl.

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PF1009 2024 2 Atomic Structure PDF

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Test your knowledge on atomic structure and the periodic table. This quiz covers fundamental concepts such as atoms, elements, groups, and periods of the periodic table. Challenge yourself with questions about the properties of metals and other substances!

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