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 is the formula for density?
Density = Mass/Volume (Mass over volume)
How many periods are shown on the periodic table?
7
What is the atomic number of neon (Ne)?
10
True or False: tap water is in element
False
A positive ion is known as a(n)?
Cation
What is a valence electron?
Electron in the outermost energy level
When moving from left to right across the periodic table, what increases?
Atomic Number
Which is the correct formula for the compound formed between potassium and nitrogen?
K3N
What is in the nucleus in the atom?
protons and neutrons
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
Atomic number is ALWAYS the number of what?
protons
What are the elements in Group 18/8A called ?
Noble Gases
The number in front of the chemical formula in an equations in called the (for example the 24 in the equation S8 + 24F2 → 8SF6) is called what?
coefficient
What are the elements in Group 2 called ?
Alkaline Earth Metals
What are the elements in Group 1 called ?
Alkali Metals
Name all 3 subatomic particles.
Protons Neutrons Electrons
How are ions formed?
By losing or gaining valence electrons
A negatively charged ion
Anion
Freezing water is an example of what?
physical change
Hydrogen and oxygen combining to form water is an example of what type of reaction?
synthesis
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
What is Avagrado's number?
6.02*1023
Wahta Law tells us that after the reaction, the contents are changed but the total mass does not change.
Conservation of Mass
Ionic bonds most commonly form between which of the following?
metal and nonmetal
Fluorine, chlorine, bromine, and iodine belong to the family of ______________
halogens
What is the percent composition of H2O?
%-H = 11.11%
%-O = 88.89%
Elements in Group 2A form ions with a charge of ___
+ 2
What group of elements satisfies the octet rule without forming compounds (do not react)?
Noble gas
The mass of one mole of an element is measured in what?
grams (g)
The mass number of an atom equals what?
the number of protons + number of neutrons per atom