7.3 Flashcards
1
Q
What is the mass of an atom mainly made up of?
A
Protons & Neutrons (Nucleus)
2
Q
What does the Mass number equal?
A
No. of Protons + Neutrons
3
Q
What does the Atomic number equal?
A
No. of Protons
*Protons = Electrons
4
Q
What are the classifications of elements?
A
Metals, nonmetals and metalloids
5
Q
What properties do metals have?
A
Lustrous – shine when polished Malleable – can be bent without breaking Ductile – can be stretched into wires
6
Q
Why are pure metals impractical?
A
Most are too soft.
7
Q
Where are most non-metals found?
A
In the air, as gases.
8
Q
What are metalloids?
A
Elements that act like non-metals in most ways but have some properties like metals.
Metalloids are semi-conductors (conduct electricity under certain conditions)
