chemistry Flashcards
1
Q
What is a molecule?
A
Contain two or more atoms chemically combined.
2
Q
What is an isotope
A
Atoms with the same number of protons, but different numbers of neutrons.
3
Q
In a neutral atom, the number of these particles is equal to the number of protons
A
Electrons
4
Q
he particle with about the same mass of a proton
A
Neutron
5
Q
The part of an atom that contains protons and neutrons
A
Nucleus
6
Q
The sum of protons and neutrons
A
Mass Number
7
Q
The group of elements that include neon, argon, helium and xenon
A
Noble gases
8
Q
The neutrons of an atom
A
revolve around the nucleus
