Chemistry: Atoms, Elements, and Protons
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Questions and Answers

What defines an element?

  • The number of subshells in an electron cloud
  • The number of neutrons in an atom
  • The number of protons in an atom (correct)
  • The number of electrons in an atom

What is the charge of a proton?

  • Neutral
  • Negatively charged
  • Variable
  • Positively charged (correct)

What is the function of electrons in an atom?

  • To create the nucleus
  • To orbit the protons
  • To participate in chemical reactions (correct)
  • To create bonds with neutrons

What is the arrangement of electrons in an atom?

<p>In a electron cloud with specific subshells (B)</p> Signup and view all the answers

What is the relationship between energy levels and distance from the nucleus?

<p>The farther from the nucleus, the higher the energy level (B)</p> Signup and view all the answers

What is the number of possible energy levels around the nucleus?

<p>7 (C)</p> Signup and view all the answers

What is the state of an electron that has returned to its lowest energy level?

<p>Ground state (C)</p> Signup and view all the answers

What determines the number of valence electrons in an atom?

<p>Group number (B)</p> Signup and view all the answers

What is the term for the number of protons in the nucleus of an atom?

<p>Atomic number (C)</p> Signup and view all the answers

What is the difference between isotopes of the same element?

<p>Different number of neutrons (C)</p> Signup and view all the answers

What is the average mass of all the isotopes of a particular element?

<p>Atomic mass (B)</p> Signup and view all the answers

Why do atoms strive to have a full valence shell of 8 electrons?

<p>To become a Noble Gas (B)</p> Signup and view all the answers

What is the atomic mass of an element based on?

<p>The weighted average of the naturally occurring isotopes of the element (B)</p> Signup and view all the answers

What is the basis of the modern periodic table?

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

What is the main difference between a molecule and a compound?

<p>The number of different elements in the molecule (B)</p> Signup and view all the answers

What is the main organizational feature of the periodic table?

<p>Horizontal rows called periods and vertical columns called groups (D)</p> Signup and view all the answers

What is the definition of matter?

<p>Anything that has mass and occupies space (D)</p> Signup and view all the answers

What is the characteristic of a metalloid?

<p>It exhibits some properties of metals and some properties of nonmetals (A)</p> Signup and view all the answers

What is the Law of Triads?

<p>A method of organizing elements based on their similarity in every third element (B)</p> Signup and view all the answers

What is the characteristic of a compound?

<p>It is a pure substance formed by the chemical combination of at least two different elements (C)</p> Signup and view all the answers

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