Download Build an Atom

Build an Atom PhET Lab ANSWERS
Introduction: Atoms are the smallest things that retain the properties of matter we can observe. Atoms are made of three
subatomic particles; protons, neutrons, and electrons. Go to the following website: http://phet.colorado.edu/

Protons have a mass of __1___ amu and a POSITIVE charge.

Neutrons have a mass of __1___ amu and a NEUTRAL charge.

Electrons have a mass of approximately__1/1836_ amu and a NEGATIVE charge.

Which sub-atomic particle(s) are responsible for an atom’s mass? PROTNS AND NUETRONS.
Analysis Questions
1.
Ions are atoms of the same element with different numbers of ELECTRONS.
2.
Isotopes are atoms of the same element with different numbers of NEUTRONS.
3.
Adding or removing protons from an atom does what to the atom? CHANGE THE ELEMENT.
4.
An atom with the same number of protons and electrons has a charge of ZERO (NEUTRAL)
5.
Adding two electrons to a neutral atom produces an ion with a charge of -2 (NEGATIVLY CHARGED).
6.
An atom with six protons and five electrons would have a charge of +1 (POSITVLEY CHARGED).
7.
What atom is created with nine protons, nine neutrons, and nine electrons? FLUORINE
8.
Show the full symbol for the above atom in the box at the right. Fl
9.
What does the upper-left number in the symbol represent? Atomic mass
19
Fl
10. What does the lower-left number in the symbol represent? Atomic Number
9
11. Build an atom with six protons, six neutrons, two energy levels and a full valence level.
6P
6N
Electron
3
12. Build any a neutral atom and copy it into your notebook. ANSWERS WILL VARY
P
– MAKE SURE THE # OF PROTONS AND # OF ELECTRONS ARE EQUAL
Build a -3 ion and copy it into your notebook.
4
N3P
3
P
4N
13. Build a model of a Nobel Gas and copy it into your3notebook. NEON
P
4
2P
2N
or
10P
10N
4
N
HELIUM
2P
2N
3
P
3
P
4
N
4
N
14. Build a model of an isotope carbon and copy it into
N your notebook. CARBON 14 (2 EXTRA NEUTRONS VS. CARBON 12
6P
8N
3
P