Chem Flashcards
For test (8 cards)
1
Q
What is an isotope?
A
Same number of protons, different number of neutrons
2
Q
1s2 2s2 2p6 3s2 3p6, what is this element?
A
Argon
3
Q
What are valence electrons?
A
Electrons in the outer shell
4
Q
What is the definition of a chemical change?
A
A change of materials into another, new materials with different properties
5
Q
Provide example of an isotope?
A
Isotope are 1h1 1h2 1h3
6
Q
What is the definition of a physical change?
A
transitions from one state to another
7
Q
Explain why Hydrogen doesn’t necessarily fit into any one position on the periodic table.
A
It can gain one electron which other elements do not in group 1.
8
Q
Helium is considered non-reactive because
A
It holds the maximum number of valence electrons
