Chemistry 1
What number do you use to find the number of protons?
atomic number
What are the 3 main states of matter?
Solid, liquid, gas
What is the 25th element called?
Manganese or Mn
What determines charge and bonds?
What are the elements in Group 2 called ?
Alkaline Earth Metals
How many periods are shown on the periodic table?
7
What is the atomic number of neon (Ne)?
10
Name all 3 subatomic particles.
Protons Neutrons Electrons
A positive ion is known as a(n)?
Cation
What is a valence electron?
Electron in the outermost energy level
A Positive Charged Ion
Cation
Elements in Group 2A form ions with a charge of ___
+ 2
What is in the nucleus in the atom?
protons and neutrons
What are the elements in Group 1 called ?
Alkali Metals
Atomic number is ALWAYS the number of what?
protons
What are the elements in Group 18/8A called ?
Noble Gases
A negatively charged ion
Anion
Freezing water is an example of what?
physical change
8
The sum of protons and neutrons in the nucleus of an atom is known as the _________
Mass number
How many valence electrons make a full shell?
8
How many Valance Electrons does Aluminum have?
3
What is the formula for density?
Density = Mass/Volume (Mass over volume)
Ionic bonds most commonly form between which of the following?
metal and nonmetal
Fluorine, chlorine, bromine, and iodine belong to the family of ______________
halogens
How are ions formed?
By losing or gaining valence electrons
Which is the correct formula for the compound formed between potassium and nitrogen?
K3N
What group of elements satisfies the octet rule without forming compounds (do not react)?
Noble gas
The small number to the right of a chemical symbol inan equations in called the (for example the 8 in the equation S8 + 24F2 → 8SF6) is called the
subscript
The mass number of an atom equals what?
the number of protons + number of neutrons per atom