Chemical Physical Property
freezing point, state, conductivity are examples of which type of property?
physical property
Are groups or families on the periodic table vertical or horizontal?
vertical
Everything is either matter or _____________.
energy
name 3 noble gases in the first 20 elements
He, Ne, Ar
which model shows electron configuration?
Bohr
a substance's ability to change into other substances is an example of what?
chemical property
what do families on the periodic table have in common?
characteristics and reactivity
Is methane (CH4) an example of a molecule, a compound or both?
both
Name an element in the first 20 that has 22 neutrons.
Argon
Which model shows just valance electrons?
Lewis
catching fire and burning in air are examples of what property?
chemical property
Mendeleev first ordered the periodic table by what?
atomic mass
How many elements in the first 20 naturally occur in liquid form?
none
How many valance electrons are characteristic of the Alkaline Earth Metals?
two
malleability and conductivity are physical properties that describe what?
malleable - flexible, bendable, moldable conductivity - ability to transfer heat and electricity
What happens when you move down by a period?
add an orbital
True/False: The atomic number always tells you the number of protons and electrons
false. ions have a different number of electrons than the atomic number
How many alkali metals are there in the first 20 elements?
three
Draw a Bohr diagram for Potassium (K)
2 - 8 -8 -1
What needs to be added to bread dough and yeast in order to produce a chemical change?
heat
How many neutrons are in lead?
125
There are 7 metalloids. Name 5.
B, Si, Ge, As, Te, Sb, Po
name all the elements in the first 20 that have the same number of protons as neutrons.
Ca, S, Si, Mg, Ne, He, C, N, O
Based on the Lewis dot structures how many Hydrogens have to bond to Nitrogen to make a stable molecule?
three