chemistry 1
what is a valence electron
an electron on the outermost energy level of an atom
what particles can be found in the nucleus of an atom
protons and neutrons
the amount of stuff that makes up something is called...
mass
how many electrons can the first energy level of an atom hold
2
true or false: molecules are made up of multiple atoms
true
what are the vertical columns of the periodic table called
groups
how many protons, electrons, and neutrons does nitrogen have?
7 electrons, 7 protons, 7 neutrons.
how many valence electrons does an atom need to become stable?
8
how does an atom get a full outer shell of electrons?
It makes chemical bonds with other atoms.
What does the column number of each group on the periodic table mean?
The number of valence electrons.
Which group of the periodic table is the least likely to make a chemical reaction?
The noble gasses.
What does the row number on the periodic table mean?
The amount of shells or energy levels an atom has.
An ionic bond is the transfer of...
electrons
How do you find the number of neutrons an atom has?
Atomic mass - atomic number
What is the formula for finding the density of an object?
mass / volume
balance this chemical equation: __HCl + CaCO3-->H2O + CO2
2HCl + 1CaCO3 ---> 1CaCl2 + 1H2O + CO2
What is the charge of an atom with 8 protons and 10 electrons?
-2
A neutral charged atom has 6 protons. How many electrons does it have?
6 electrons.
C3H8O +O2 ---> CO2 + H2O
what are the molecules on the left side of the arrow called in a chemical reaction?
Thee reactants.
What type of reaction releases heat?
Exothermic reaction
What kind of reaction has a decrease in temperature?
An endothermic reaction.
A covalent bond takes place between...
non metals and non metals
a metallic bond takes place between...
metals and metals
an ionic bond takes place between...
metals and non metals.
A polar bond means that...
One side of the molecule has a slightly more positive or negative charge than the other side.