Atoms, Elements, and Compounds Flashcards
(10 cards)
1
Q
What is an atom?
A
The smallest unit of an element.
2
Q
What is an element?
A
A substance made of only one type of atom.
3
Q
What is a compound?
A
A substance containing two or more chemically bonded elements.
4
Q
What are isotopes?
A
Atoms of the same element with different neutron numbers.
5
Q
What charge does a neutron have?
A
Neutral (0).
6
Q
What is relative atomic mass (Ar)?
A
The weighted average mass of an element’s isotopes.
7
Q
What is the atomic number?
A
The number of protons in an atom.
8
Q
Why do noble gases not react?
A
They have full outer electron shells.
9
Q
What is an ion?
A
A charged particle formed when atoms lose/gain electrons.
10
Q
What is a molecule?
A
Two or more atoms chemically bonded together.
