Lesson Worksheet: Halogens Chemistry • 7th Grade

In this worksheet, we will practice describing the compounds and reactivities of halogens and the trends in their physical and chemical properties.


Which of the following is a halogen?

  • AArsenic
  • BThallium
  • CAstatine
  • DSelenium
  • EGermanium


Halogens can generally be found as diatomic molecules (e.g., I2). What type of bonding occurs in these molecules?

  • ACovalent
  • BMetallic
  • CIonic


Which of the following is not a property of the halogens?

  • AThey have low melting points.
  • BThey are good thermal conductors.
  • CThey are colored.
  • DThey are poor electrical conductors.
  • EThey have low boiling points.


As halogens increase in atomic number, which of the following trends is observed?

  • AToxicity increases.
  • BReactivity decreases.
  • CBoiling point decreases.
  • DMelting point decreases.
  • EAtomic radius decreases.


Which of the following statements about the colors of halogens is correct?

  • AThe colors become darker as the atomic number increases.
  • BThe colors become lighter as the atomic number increases.
  • CThe lighter-colored halogens are less reactive.
  • DAstatine is likely to have a white color.
  • EThe colors do not have a pattern.


Which statement explains why the different halogens in group 17 react in similar ways?

  • AThey all have seven valence electrons.
  • BThey all form diatomic molecules.
  • CThey are all colored elements.
  • DThey all have low boiling points.
  • EThey are all gases.


Which of the following statements explains why reactivity decreases down group 17?

  • AAs the atoms get larger, the positive nucleus can attract an electron more easily.
  • BAs the atoms get larger, they become more closely packed.
  • CAs the atoms get larger, they contain more electrons.
  • DAs the atoms get larger, electrons are lost more easily.
  • EAs the atoms get larger, the positive nucleus cannot attract an electron as easily.


A halogen displacement reaction is shown in the following equation: X+2Br()Br()+2X()22aqgaq

What is the color change that occurs when the bromide solution is converted to bromine gas? What halogen could X2 be?

  • AColorless to purple, chlorine
  • BColorless to brown, iodine
  • CColorless to brown, chlorine
  • DBrown to colorless, iodine
  • EBrown to colorless, chlorine


As you descend group 17 from F2 to I2, intermolecular forces between the molecules increase. Which group 17 trend is the result of the increased intermolecular forces?

  • AMelting and boiling points increase down the group.
  • BHalogens have greater atomic mass down the group.
  • CThe colors of halogens get darker down the group.
  • DThe reactivity of halogens increases down the group.
  • EMelting and boiling points decrease down the group.


Fluorine reacts with hydrogen explosively in cold conditions, whereas iodine and hydrogen only partially react even with constant heating. Which statement best describes why these differences are observed?

  • AFluorine is less dense than iodine.
  • BFluorine gains an outer electron more easily than iodine.
  • CIodine is a darker color than fluorine.
  • DHalogens increase in reactivity as you go down the group.
  • EThe fluorine atoms have gained an electron and formed negative ions.

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