Gr 10 Physical Sciences Ch 2: Structure of the atom
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Questions and Answers

What is the charge of an electron?

  • 9.11 × 10⁻³¹ C positive
  • 9.11 × 10⁻³¹ C negative
  • 1.6 × 10⁻¹⁹ C positive
  • 1.6 × 10⁻¹⁹ C negative (correct)

    • What determines the atomic number of an element?

  • The number of protons in the nucleus (correct)
  • The number of neutrons in the nucleus
  • The number of electrons in the outer region
  • The mass of the electron

    • What is the mass of a proton?

  • 9.11 × 10⁻³¹ kg
  • 1.6749 × 10⁻²⁷ kg
  • 1.6 × 10⁻¹⁹ kg
  • 1.6726 × 10⁻²⁷ kg (correct)

    • What is the role of neutrons in the nucleus?

    <p>They contribute to the atomic mass</p> Signup and view all the answers

    What is the location of electrons in an atom?

    <p>In the outer regions of the atom</p> Signup and view all the answers

    What is the charge of a proton?

    <p>1.6 × 10⁻¹⁹ C positive</p> Signup and view all the answers

    What is the approximate mass of an electron?

    <p>9.11 × 10⁻³¹ kg</p> Signup and view all the answers

    Why do neutrons contribute to the atomic mass?

    <p>Because they have a significant mass</p> Signup and view all the answers

    What is the atomic number of an atom?

    <p>The number of protons in the nucleus</p> Signup and view all the answers

    What is the atomic mass number of an atom?

    <p>The sum of protons and neutrons in the nucleus</p> Signup and view all the answers

    What is the chemical symbol of an element?

    <p>A unique abbreviation for the element</p> Signup and view all the answers

    What is an isotope of an element?

    <p>An atom with a different number of neutrons</p> Signup and view all the answers

    What is a cation?

    <p>A positively charged ion</p> Signup and view all the answers

    What is an anion?

    <p>A negatively charged ion</p> Signup and view all the answers

    What is the difference between a neutral atom and an ion?

    <p>The number of electrons</p> Signup and view all the answers

    What is the standard notation for representing an element?

    <p>(^{A}_{Z}Symbol)</p> Signup and view all the answers

    Which of the following subatomic particles has a positive electric charge?

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

    What is the primary function of electrons in an atom?

    <p>To participate in chemical reactions</p> Signup and view all the answers

    Which subatomic particle is responsible for determining the chemical properties of an element?

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

    What is the significance of the number of protons in a neutral atom?

    <p>It balances the number of electrons</p> Signup and view all the answers

    What is the role of neutrons in the nucleus?

    <p>To stabilize the nucleus</p> Signup and view all the answers

    What is the relationship between the number of protons and electrons in a neutral atom?

    <p>The number of protons is equal to the number of electrons</p> Signup and view all the answers

    What is the significance of the atomic number of an element?

    <p>It determines the chemical properties</p> Signup and view all the answers

    What is the characteristic of the mass of protons and neutrons?

    <p>They are similar in mass</p> Signup and view all the answers

    What is the primary function of the atomic number in an atom?

    <p>To identify the element and its properties</p> Signup and view all the answers

    What is the sum of protons and neutrons in the nucleus of an atom?

    <p>Atomic mass number</p> Signup and view all the answers

    What is the primary difference between isotopes of the same element?

    <p>Number of neutrons</p> Signup and view all the answers

    What is the result of an atom losing one electron?

    <p>A positively charged ion</p> Signup and view all the answers

    What is the symbol for a carbon atom with 6 protons and 6 neutrons?

    <p>^{12}_6C</p> Signup and view all the answers

    Why do isotopes of the same element exhibit the same chemical properties?

    <p>Because they have the same atomic number</p> Signup and view all the answers

    What is the charge of a sodium ion (Na⁺) formed by the loss of one electron from a sodium atom?

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

    What is the difference between a neutral atom and an ion?

    <p>Number of electrons</p> Signup and view all the answers

    Which of the following subatomic particles has no electric charge?

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

    What determines the position of an element in the periodic table?

    <p>Number of protons</p> Signup and view all the answers

    Which of the following is true about the mass of protons and neutrons?

    <p>Protons and neutrons have roughly similar masses</p> Signup and view all the answers

    What is the primary function of electrons in chemical reactions?

    <p>To interact with electrons from other atoms</p> Signup and view all the answers

    Which of the following is a characteristic of isotopes of the same element?

    <p>They have the same number of protons</p> Signup and view all the answers

    What is the relationship between the number of protons and electrons in a neutral atom?

    <p>The number of protons is equal to the number of electrons</p> Signup and view all the answers

    What determines the atomic mass of an element?

    <p>Sum of protons and neutrons</p> Signup and view all the answers

    What is the primary function of the nucleus in an atom?

    <p>To stabilize the atom</p> Signup and view all the answers

    What is the primary function of the atomic number in an atom?

    <p>Defining the identity of the element</p> Signup and view all the answers

    What is the difference between a carbon-12 atom and a carbon-14 atom?

    <p>The number of neutrons in the nucleus</p> Signup and view all the answers

    What is the result of an atom gaining one electron?

    <p>An anion is formed</p> Signup and view all the answers

    What is the significance of the atomic mass number of an element?

    <p>It provides a measure of the mass of the nucleus</p> Signup and view all the answers

    What is the characteristic of the atomic number of an element?

    <p>It is unique to each element</p> Signup and view all the answers

    What is the notation for representing an element with an atomic number of 6 and an atomic mass number of 12?

    <p>¹²C₆</p> Signup and view all the answers

    Why do atoms of the same element with different atomic mass numbers exhibit the same chemical properties?

    <p>Because they have identical numbers of protons and electrons</p> Signup and view all the answers

    What is the result of an atom losing one electron?

    <p>A cation is formed</p> Signup and view all the answers

    What is the primary reason why isotopes of the same element exhibit the same chemical properties?

    <p>They have the same number of protons and electrons</p> Signup and view all the answers

    Which of the following statements is true about the atomic number of an element?

    <p>It determines the chemical properties of an element</p> Signup and view all the answers

    What is the result of an atom gaining or losing electrons?

    <p>It becomes an ion</p> Signup and view all the answers

    What is the significance of the atomic mass number of an element?

    <p>It provides a measure of the mass of the nucleus and indirectly the mass of the atom</p> Signup and view all the answers

    Which of the following statements is true about cations and anions?

    <p>Cations are positively charged ions and anions are negatively charged ions</p> Signup and view all the answers

    What is the difference between the atomic number and the atomic mass number of an element?

    <p>The atomic number is the number of protons and the atomic mass number is the sum of protons and neutrons</p> Signup and view all the answers

    What is the notation for representing an element with an atomic number of 6 and an atomic mass number of 14?

    <p>₆¹⁴C</p> Signup and view all the answers

    What is the primary reason why atoms of the same element have different atomic mass numbers?

    <p>They have different numbers of neutrons</p> Signup and view all the answers

    What is the primary reason why electrons are fundamental in chemical reactions and bonding?

    <p>They occupy the outer regions of atoms and interact with electrons from other atoms.</p> Signup and view all the answers

    What is the relationship between the number of protons and electrons in a neutral atom?

    <p>The number of protons is equal to the number of electrons.</p> Signup and view all the answers

    What is the primary function of the nucleus in an atom?

    <p>To stabilize the atom and determine its chemical properties.</p> Signup and view all the answers

    What is the characteristic of the mass of protons and neutrons?

    <p>They are roughly similar in mass and significantly greater than that of electrons.</p> Signup and view all the answers

    What determines the position of an element in the periodic table?

    <p>The atomic number of the element.</p> Signup and view all the answers

    What is the significance of the atomic number of an element?

    <p>It determines the chemical properties of the element.</p> Signup and view all the answers

    What is the primary difference between isotopes of the same element?

    <p>The number of neutrons in the nucleus.</p> Signup and view all the answers

    What is the significance of the atomic mass number of an element?

    <p>It is a sum of protons and neutrons in the nucleus.</p> Signup and view all the answers

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