We’re being asked to identify which best describes a pair of elements that will form an ionic bond. Let’s first define a covalent bond and an ionic bond.
• Covalent or Molecular Compound
▪ composed of more than one nonmetal together
▪ nonmetal + nonmetal = covalent bond
• Ionic Compound
▪ composed of a positive ion called a cation connected to a negative ion called an anion.
▪ positive ions (cations) are usually metals and negative ions (anion) are usually nonmetals
metal + nonmetal = ionic bond
▪ cations and anions can also be polyatomic ions (example: NH4+, CH3COO-, SO42-)
Which of the following best describes a pair of elements that will form an ionic bond?
A. C and H: Hydrogen easily loses electrons, and carbon gains them.
B. Li and O: Oxygen easily loses electrons, and lithium gains them.
C. P and Cl: Phosphorus easily loses electrons, and chlorine gains them.
D. Ca and Br: Calcium easily loses electrons, and bromine gains them.
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What scientific concept do you need to know in order to solve this problem?
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