Science - 2017-18
PS.4 c - Bonding
The student will investigate and understand the organization and use of the periodic table of elements to obtain information. Key concepts include
c) formation of compounds through ionic and covalent bonding.
Bloom's Levels: Analyze; Understand
- Chemical bonding occurs as a result of attractive forces between particles.
- I can describe the compounds in my food and drinks.
UNDERSTANDING THE STANDARD
- Metals tend to lose electrons in chemical reactions, forming positive ions. Nonmetals tend to gain electrons in chemical reactions, forming negative ions.
- Gaining or losing electrons makes an atom an ion.
- Gaining or losing neutrons makes an atom an isotope. However, gaining or losing a proton makes an atom into a completely different element.
- Atoms react to form chemically stable substances that are held together by chemical bonds and are represented by chemical formulas. To become chemically stable, atoms gain, lose, or share electrons.
- Compounds are formed when elements react chemically. When a metallic element reacts with a nonmetallic element, their atoms gain and lose electrons respectively, forming ionic bonds. Generally, when two nonmetals react, atoms share electrons, forming covalent (molecular) bonds.
In order to meet this standard, it is expected that students will
c) given a chemical formula of a compound, identify the elements and the number of atoms of each that comprise the compound.
recognize that the number of electrons in the outermost energy level determines an element’s chemical properties or chemical reactivity.
describe the difference between ionic and covalent bonding.predict what kind of bond (ionic or covalent) will likely form when metals and nonmetals are chemically combined.
periodic table of elements, periods, ion, isotope, metals, nonmetals, compound, atomic number, atomic mass, ionic bond, covalent bond, metalloids, element, valence electrons, family