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)


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