Atom Basics
Charges
How Many?
Isotopes
Atomic Mass, Mass Number, Atomic Number
100
The smallest unit of matter.
Atom
100
The subatomic particle with a positive charge
proton
100
How many protons are in the atom, below?
3 protons
100
Isotopes of a particular element have different numbers of
neutrons
100
Atomic number is the number of
Protons
200
Protons, electrons, and neutrons are considered
subatomic particles
200
The subatomic particle with a negative charge
electron
200
How many electrons can be found in this atom?
3 electrons
200
Isotopes of the same element always have the same number of
protons
200
Mass number is the number of
protons + neutrons
300
What can be found outside of the nucleus in a cloud?
Electrons
300
The nucleus of an atom has a _______ charge.
positive
300
How many neutrons can be found in Carbon-14?
8 neutrons
300
Are the two elements below, Isotopes or different elements?
Element C - 8 p+ and 9 n0
Element D - 10 p+ and 9 n0
Different elements
300
What is the mass number of this atom?
4
mass number = p+ + n0
400
The center of an atom is called
nucleus
400
What two subatomic particles are attracted to each other?
protons (+) and electrons (-)
400
How many neutrons can be found in this isotope of oxygen?
*HINT: We have not learned about 2-, yet.
8 neutrons
16 - 8 = 8
400
Are the two elements below, Isotopes or different elements?
Element E - mass number is 3 and atomic number is 4
Element F - mass number is 3 and atomic number is 3
Different Elements
400
What is the atomic number of neon?
10
500
What two subatomic particles contribute to most of the mass of an atom?
Protons and Neutrons
500
The charge of an atom with equal protons and electrons.
neutral
500
How many neutrons does silicon-29 have?
29 - 14 = 15 neutrons
500
What does the number after the element, below, represent?
Carbon - 12
Mass Number
500
How many neutrons does Aluminum have?
14 neutrons
27 - 13 = 14
27 (rounded atomic mass)
14 (atomic number = # of protons)