Bonding~Science Quiz 4/3
What is a molecule?
A group of atoms held together by chemical bonds
What is an ion?
A particle with a positive or negative charge
T or F: An atom does not react with other atoms if it has the same number of protons as it has electrons.
False
What is a metallic bond?
Forms between metal atoms when there outermost energy levels overlap
What is an ionic bond?
- A force that brings oppositely charged ions together - electrons are transferred(gained/lost) - metal(cation)+nonmetal(anion) - compounds
What is a covalent bond?
- Forms when atoms share one or more pairs of electron - electrons are shared - forms molecules
What are chemical bonds?
An interaction that hold atoms or ions together
What can happen during a chemical change?
Bonds can break, and new bonds can form
How do atoms join together?
By forming chemical bonds
What does the space-filling model show?
Does not show the parts that make up the atoms; shows how the atoms are connected to each other
What are three ways in which an atom can form bonds with other atoms?
Electrons are donated, received, and shared
What are valence electrons?
Electrons found in the outermost energy level of an atom
T or F: All of an atom's electrons can interact with the electrons of other atoms to form bonds.
False
How are atoms rearranged?
In order for atoms to be rearranged, chemical bonds have to be formed or broken
What does the Bohr model show?
Shows the number of electrons in an atom; do not show true arrangement of electrons in an atom
What happens if the electrons in an outermost energy level are not full?
The atom is reactive
What happens to atoms during chemical changes?
The atoms are rearranged to make new substances with different properties; the chemical change does not create or destroy the atoms
T or F: The nucleus of an atom does not change when the atom undergoes a chemical reaction.
True
What does the electron cloud model show?
shows how electrons are found in a region around the nucleus; helps show general locations of the different parts of the atom; does not show number of electrons
