Understanding Elements in Science
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Questions and Answers

What is an element according to the text?

  • A mixture of different kinds of atoms
  • A compound made of multiple elements
  • A pure substance made of only one type of atom (correct)
  • A substance that can be broken down into other substances

Why is water not considered an element?

  • Because water is a mixture of different kinds of atoms
  • Because water can be broken down into other substances (correct)
  • Because water is a compound made of multiple elements
  • Because water is a pure substance made of only one type of atom

How are elements different from each other?

  • By the properties of the atoms they are made of (correct)
  • By their ability to mix with other types of atoms
  • By the number of subatomic particles within each atom
  • By the way they combine to form molecules

Why are elements compared to letters combining to form words in the text?

<p>To illustrate the diversity and combinations possible with elements (C)</p> Signup and view all the answers

What differentiates chemicals from elements?

<p>Chemicals are mixtures of elements, while elements are pure substances (D)</p> Signup and view all the answers

What are atoms made of according to the text?

<p>Subatomic particles like electrons and protons (B)</p> Signup and view all the answers

How is an atom typically structured?

<p>With a dense center and an outer, nearly empty zone around it (C)</p> Signup and view all the answers

What are the 3 main components found in an atom's nucleus?

<p>Protons, electrons, and neutrons (B)</p> Signup and view all the answers

Which element has 2 protons, 2 electrons, and 2 neutrons?

<p>Helium (A)</p> Signup and view all the answers

What determines the reactivity of an element and many of its properties?

<p>The number of electrons in the electron cloud (C)</p> Signup and view all the answers

What is the lightest and most abundant element in the universe?

<p>Hydrogen (A)</p> Signup and view all the answers

Why are hydrogen and helium, despite similar protons and electrons, different in stability?

<p>Due to having different numbers of neutrons (B)</p> Signup and view all the answers

Which category of elements on the Periodic Table are typically solid at room temperature and good conductors of electricity?

<p>Metals (A)</p> Signup and view all the answers

Why are non-metal elements described as dull and brittle?

<p>Due to being poor conductors of heat and electricity (B)</p> Signup and view all the answers

Why is water not considered an element?

<p>Water consists of multiple types of atoms. (D)</p> Signup and view all the answers

How are elements different from chemicals according to the text?

<p>Elements are made of one kind of atom, while chemicals can be compounds. (A)</p> Signup and view all the answers

What do elements combine to form, according to the text?

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

What do atoms consist of, based on the text?

<p>Protons, neutrons, and electrons (D)</p> Signup and view all the answers

Why are elements compared to letters combining to form words in the text?

<p>To emphasize their unique properties (D)</p> Signup and view all the answers

What determines if something is considered matter according to the text?

<p>Whether it can be broken down into other substances (C)</p> Signup and view all the answers

Why are elements described as pure substances according to the text?

<p>They consist of only one type of atom (B)</p> Signup and view all the answers

What is the location of protons and neutrons in an atom?

<p>Nucleus (D)</p> Signup and view all the answers

Which element is described as typically a solid and highly reactive?

<p>Lithium (D)</p> Signup and view all the answers

Why are hydrogen and helium mentioned as different despite their similar proton and electron numbers?

<p>Helium is highly reactive while hydrogen is stable (B)</p> Signup and view all the answers

What determines the reactivity of an element and many of its properties?

<p>Number and location of electrons (D)</p> Signup and view all the answers

Why are non-metal elements described as poor conductors of heat and electricity?

<p>Lack of free-moving electrons (B)</p> Signup and view all the answers

What makes each element unique?

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

How many natural elements are known to scientists?

<p>92 (A)</p> Signup and view all the answers

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