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chemistry CH2 Quiz one Practice

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Terms in this set (31)

  • According to the atomic theory, what happens to atoms during a chemical reaction?
    Atoms are neither created nor destroyed during a chemical reaction.
  • What particles make up all matter according to atomic theory?
    All matter is made up of tiny particles called atoms.
  • What is the correct number of protons, neutrons, and electrons in a neutral atom of Sn with atomic number 50 and mass number 118?
    50 protons, 68 neutrons, and 50 electrons.
  • How does atomic size change across a period in the periodic table?
    Atomic size decreases going across a period.
  • What are the characteristics of Group 8A (18) elements?
    They are unreactive and rarely found in combination with other elements.
  • What defines isotopes of the same element?
    Isotopes have the same atomic number but different numbers of neutrons.
  • How does ionization energy change going down a group in the periodic table?
    Ionization energy decreases going down within a group.
  • What is the atomic mass of chlorine if it has isotopes Cl-35 (75.8%) and Cl-37 (24.3%)?
    The atomic mass will be between 35 and 37.
  • What is the chemical symbol for iron?
    Fe
  • What element does the symbol Ca represent?
    Calcium
  • In a neutral atom with 30 protons and 34 neutrons, how many electrons are present?
    30 electrons
  • What particles are found in the nucleus of an atom?
    All the protons and neutrons.
  • What is the mass number of a potassium atom with 20 neutrons?
    39 (mass number = protons + neutrons)
  • In an electron-dot symbol, what do the dots represent?
    The valence electrons.
  • How many valence electrons does a Group A element have?
    Its group number.
  • How many valence electrons are in Group 3A (13) elements?
    3 valence electrons.
  • What does the electron arrangement of an atom show?
    The number of electrons in each energy level.
  • What is the correct symbol for potassium?
    K
  • Where are valence electrons located in an atom?
    In the outermost energy level of an atom.
  • What is a characteristic of the modern periodic table?
    Elements in each group have similar chemical properties.
  • What element has the electron arrangement 2,8,7?
    Chlorine (Cl)
  • What is the maximum number of electrons in the third energy level?
    18 electrons.
  • What is the atomic number of an element with 30 protons?
    30
  • What is the correct electron arrangement for lithium?
    2,1
  • What is not true about the isotopes 13N, 14N, and 15N?
    They do not all have the same mass number.
  • Which element has chemical properties similar to magnesium?
    Strontium
  • What is the correct symbol for gold?
    Au
  • What does the atomic mass of an element represent?
    The mass of an average atom, considering isotopes.
  • How does metallic character change going down a group?
    Metallic character increases going down within a group.
  • What is the electron arrangement for aluminum?
    2,8,3
  • How many electrons are in the outer energy level of a neutral boron atom (atomic number 5)?
    3 electrons.