Chemistry Flashcards
Bohr diagram use what to represent the energy levels of an atom
rings
In bohr diagrams what is the maximum number of valence electrons ?
2
8
8
Energy levels closest to the atom hold _______ _______ and are ____ in energy
Fewer electrons, lower
Equation for finding neutrons
Atomic mass= atomic # + neutrons
What is it called when you have a different # of neutrons ?
Isotope
Lewis dot diagrams use what around the element symbol to represent electrons ?
Dots
In Lewis dot diagrams only electrons in the outer shell are shown which are called what?
Valence electrons (up to 2 on each side)
What are the dots useful for in Lewis dot diagrams
To show chemical bonding
Do ionic bonds take or share ?
Take electrons (nonmetal to metal)
To covalent bonds take or share?
Share electrons (nonmetal to nonmetal)
What is the charge location size and symbol of a proton
+
Inside nucleus
Large
P+
What is the charge location size and symbol for a neutron
0
Inside nucleus
Large
N^0
What is the charge location size and symbol for an electron
-
Outside nucleus
Very tiny
E-
pH < 7
Acid which is red
pH of 1 is a strong acid
pH > 7
Base which is blue
pH of 14 = strong base
Protons is the same as what
The atomic number
Electrons are the same if neutral
Group number is the same as what
Valence electrons without the 1
Some compounds form acids or bases when compounds break up into ions they dissolve in water H30+
When dissolving in water:
Acids- release H+(hydrogen) ions
H+H20 = H30
Bases- remove H+ ions
H20= OH- + H
Humans need a pH around ____
7.0
Azalea plants need acidic soil which has a pH of ___
4.5
pH paper gives u what type of information? What numbers does the scale go through ?
Specific information #1-14
Litmus paper
Qualitative indicates acid or base
