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Pre-Test
Charges
Subatomic
Numbers
Periodic Table
100
This is the smallest part of an element.
What is an atom?
100
Objects with the same charge do this when they come close to each other.
What is repel?
100
Three subatomic particles.
What are protons, neutrons, and electrons?
100
The sum of protons and neutrons in the nucleus of an atom.
What is mass number?
100
How many valence electrons in group #1?

1

200
Neutrons are located outside of the nucleus. True or False?
False!
200
These particles act as a buffer and have no charge.
What are neutrons?
200
Located outside of the nucleus and have a negative charge.
What are electrons?
200
The number of protons in an atom of a certain element.
What is atomic number?
200

How many valence electrons in group 2?

2

300
What is the term that describes electrons that have moved to a higher energy level?
Election excitation
300
When an atom gains an electron it has this kind of electrical charge.
What is negative?
300
This is equal to one atomic mass unit.
What is 1/12th the mass of a Carbon -12 atom?
300
The atomic number of Francium.
What is 87?
300

How many valence electrons in group 15?

5

400
An atom of potassium with a charge of +1 had this many valence electrons.
What is 8?
400
When an atom gains or loses an electron it is called this.
What is an ion?
400
Atoms of different elements have different numbers of these.
What are protons?
400
The mass number of Potassium.
What is 39.098?
400

Which group is the most reactive metal?

Group 1- Alkali metals

500
Explain the difference between Mass # and Atomic mass.
What is the mass of one atom versus the average mass of all atoms of an element
500
An atom that is neither positively or negatively charged.
What is neutral?
500
An atom with the same number of protons but different number of neutrons.
What is an isotope?
500
Mass number - atomic number = ______ __ ________.
What is the number of neutrons?
500

Which group is non reactive/stable? 

Group 18- The noble gases