Mod H, U3, Les 3 Electrons And Chemical Bonding Flashcards
What is a chemical bond?
An interaction that holds atoms or ions together
What happens to atoms during chemical changes?
Atoms are rearranged to make new substances with different properties, but no atoms are destroyed nor created.
What are the three types of atom models used by scientists?
Bohr model: shows # of electrons in rings around nucleus
Space-filling: shows solid spheres and how atoms connect together
Electron cloud: shows general locations of electrons, but not the #
What is meant by the energy levels around the nucleus?
These are the rings around the nucleus which hold a specific number of electrons in each (see p. 185). Remember, think of it like small roads encircling the nucleus that electrons travel on.
What is the maximum number of electrons that can be in the first and second rings that the Bohr models show?
Ring 1 has 2
Ring 2 has 8
What are valence electrons?
These are electrons found in the outermost energy level of an atom
When looking at the periodic table, how can the atomic number of an atom tell us how many electrons each element contains?
The atomic number tells the number of protons in each atom. In a stable atom, the number of protons and electrons are equal. (The same number)
When looking at the periodic table, What can you learn about the elements in the same group or vertical column (column #1-2, and 13-18)?
The number of valence electrons are the same.
In the periodic table, elements in group 18 have full outermost energy levels. What does this tell you about how they react with other elements?
They are unreactive and don’t tend to form bonds.
What is an ion?
this is an element that has gained or lost an electron and becomes charged. (Either negative or positive)
