Definitions
particle in an atom that has no charge
neutron
number of protons =
atomic number
A horizontal row on the periodic table is called a:
period
What types of elements will form an ionic bond?
metal + nonmetal
when 2 elements combine, do they form a new substance or retain the chemical properties of their own element?
they form a new substance with new properties
nucleus
number of protons + number of neutrons =
group
What types of elements form a covalent bond?
Which model of the atom uses orbits to show the energy level of electrons?
Bohr model
negatively charged particles in the outermost energy level of an atom
valence electrons
the weighted average of all naturally occurring isotopes of an element =
average atomic mass
The periodic table is arranged in order of increasing:
atomic number
What are 2 properties of metallic compounds?
good conductors of heat and electricity, malleable, ductile
Why don't noble gasses form bonds usually?
they already have a full outer shell of valence electrons; they are "happy"
An atom with a positive or negative charge
ion
If a particle has 7 protons, 8 neutrons, and 7 electrons, what is its atomic number? What is its mass number?
atomic number: 7
mass number: 15
3 types of elements found on the periodic table
metals, nonmetals, metalloids
What are 2 properties of ionic compounds?
brittle, high melting/boiling point, soluble in water, good conductors as liquid or dissolved, crystal lattice structure
Describe how atomic theory has changed over time
answers will vary
Versions of the same element with different number of neutrons
Isotopes
2+
What is an example of a trend on the periodic table?
decreasing atomic size left to right
What are 2 properties of covalent compounds?
Groups in the periodic table have similar properties because:
they have the same number of valence electrons